We are a leading global supplier of automatic test equipment.

Our automatic test equipment products include:

Broadband Test Systems and Diagnostic Solutions have been combined into “Other Test Systems” for purposes of our segment reporting. For financial information concerning our reportable segments and geographical data, see “Note S: Operating Segment and Geographic Information” in Notes to Consolidated Financial Statements.

On November 30, 2005, we completed the sale of substantially all of the assets and certain of the liabilities of our interconnection systems products business that designs and manufactures backplane systems, printed circuit boards and high-speed, high-density connectors (“Connection Systems”), including the capital stock of our wholly-owned subsidiaries, Teradyne Connection Systems (Malaysia) Sdn. Bhd., Teradyne Connection Sys. De Mexico S.A. de C.V. and Teradyne Ireland Ltd., to Amphenol Corporation pursuant to an asset and stock purchase agreement, dated as of October 10, 2005, between Teradyne and Amphenol, as amended.

In accordance with Statement of Financial Accounting Standards (“SFAS”) No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets” (“SFAS 144”), we are reporting Connection Systems as a discontinued operation in the consolidated financial statements for all periods presented. See “Note E: Discontinued Operations” in Notes to Consolidated Financial Statements for further discussion of the Connection Systems divestiture. Unless indicated otherwise, amounts provided throughout this Form 10-K relate to continuing operations only.

Statements in this Annual Report on Form 10-K which are not historical facts, or so called “forward-looking statements,” are made pursuant to the safe harbor provisions of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Investors are cautioned that all forward-looking statements involve risks and uncertainties and are qualified in their entirety by reference to the risk factors described in “Item 1A: Risk Factors” and those risks detailed in our filings with the Securities and Exchange Commission (the “SEC”).

Investor Information

We are a Massachusetts corporation incorporated on September 23, 1960. We are subject to the informational requirements of the Exchange Act. We file periodic reports, proxy statements and other information with the SEC. Such reports, proxy statements and other information may be obtained by visiting the Public Reference Room of the SEC at 100 F Street, N.E., Washington, DC 20549 or by calling the SEC at 1-800-SEC-0330. In addition, the SEC maintains an internet site (http://www.sec.gov) that contains reports, proxy and information statements and other information regarding issuers that file electronically.

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You can access financial and other information, including the charters of our Audit Committee, Compensation Committee and Nominating and Corporate Governance Committee, our Corporate Governance Guidelines and Standards of Business Conduct, by clicking the Investors link on our website at www.teradyne.com. We make available, free of charge, copies of our filings with the SEC, including our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act through our website as soon as reasonably practicable after filing such material electronically or otherwise furnishing it to the SEC.

Products

Semiconductor Test Systems

We design, manufacture, sell and support Semiconductor Test Systems on a world wide basis. The test systems we provide are used both for wafer level and device package testing. These chips are used in automotive, communications, consumer, computer and electronic game applications, among others. Semiconductor devices span a broad range of functionality, from very simple low-cost devices such as appliance microcontrollers, operational amplifiers or voltage regulators to complex digital signal processors and microprocessors. Semiconductor Test Systems are sold to Integrated Device Manufacturers (“IDMs”) that integrate the fabrication of silicon wafers into their business, “Fabless” companies that outsource the manufacturing of silicon wafers, “Foundries” that cater to the processing and manufacturing of silicon wafers, and subcontractors (“Subcons”) that provide test and assembly services for the final packaged devices to both Fabless companies and IDMs. Fabless companies perform the design of integrated circuits without manufacturing capabilities, and use Foundries for wafer manufacturing and Subcons for test and assembly. These customers obtain the overall benefit of comprehensively testing advanced performance devices while reducing their total costs associated with testing by using our Semiconductor Test Systems to:

We have made significant investments in the last several years to introduce the new FLEX™ Test Platform Architecture. The FLEX ^™ Test Platform Architecture advances our core technologies to produce test equipment that is designed for high efficiency multi-site testing. Multi-site testing involves the simultaneous testing of more devices and functions in parallel. Leading semiconductor manufacturers are using multi-site testing to significantly improve their “Cost of Test” (COT) economics. The FLEX Test Platform architecture addresses customer requirements through four key capabilities:

1) A high efficiency multi-site architecture that eliminates tester overhead such as instrument setup, synchronization and data movement, and signal processing;

2) The IG-XL™ software operating system which provides fast program development, including instant conversion from single to multi-site test;

3) Broad technology coverage by instruments designed to cover the range of test parameters, coupled with a Universal Slot test head design that allows easy test system reconfiguration to address changing test needs; and

4) An open architecture design (OpenFLEX) which complements the FLEX Test Platform’s broad set of high-density instrumentation by allowing third parties and customers to create customized test instrumentation that can further enhance system performance and test economics.

FLEX Test Platform purchases are being made by IDMs, Subcons and Fabless customers. The FLEX Test Platform has become a widely used test solution at Subcons and test houses by providing versatile testers that can handle the widest range of devices, allowing Subcons to leverage their capital investments. The broad consumer,

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automotive and broadband markets have been driving most of the device volume growth in the semiconductor industry. These markets include cell phones, set top boxes, HDTVs, game controllers, computer graphics, and automotive controllers to name a few. These end use markets are continuing to be a strong growth driver for the FLEX Test Platform family of products because they require a wide range of technologies and instrument coverage. The FLEX Test Platform has an installed base of more than 1,000 customer systems to date.

Assembly Test Systems

We also produce a variety of test and inspection systems sold to many of the industry’s leading printed circuit board (“PCB”) original equipment manufacturers (“OEMs”) and Subcons around the world. The demand for these products is being driven by rapid technological advances and the constant need to improve assembly quality. Because today’s PCBs and electronic assemblies bundle more functionality than ever before, they contain highly integrated circuits and more complex components that operate faster, use lower voltages and are more susceptible to assembly problems. Our assembly test and inspection systems combine the advanced diagnostic hardware and operating software needed to ensure product quality, sustain high manufacturing yield, verify functional operation, diagnose faults and effectively reduce manufacturing costs. Our products are sold to the electronics manufacturers of cell phones, servers, computers, Internet switches, automobiles and military avionics systems worldwide.

In-Circuit Test Systems

We manufacture in-circuit test (“ICT”) systems that are used to assess electrical interconnections, verify interoperation and find faulty circuits aboard fully assembled and soldered PCBs. Fast, accurate and cost-effective diagnostic capabilities are hallmark features of our ICT systems, including the TestStation ^™ and Spectrum ^™ product families used in a variety of in-line, high-volume PCB test applications. These systems are also used in sample test environments for prototype testing and early-stage PCB design and development. Supporting technologies such as our patented SafeTest ^™ technology allow TestStation users to safely troubleshoot the low-voltage components and interconnects commonly found in battery-powered portable consumer electronics and low-power commercial equipment. In addition to standard ICT equipment, we offer combinational test platforms and handler-ready in-line test systems for high-volume board manufacturing.

Imaging Inspection Systems

PCB assembly trends are expected to force board manufacturers to reassess their inspection strategies. Due to the growing use of highly integrated system on chips and higher density double-sided boards, a high percentage of all solder connections are invisible to optical inspection systems. Combine this growing loss of visual and electrical access with the difficulties associated with detecting lead-free solder voids on double-sided boards, and the inspection problem is compounded.

Our newly introduced Xstation ^™ MX, a fully Automated X-Ray Inspection (“AXI”) system, addresses these problems when inspecting PCBs for manufacturing defects, including improper component placement and orientation, electrical opens and shorts and a host of other board quality issues. The Xstation MX uses ClearVue ^™ , a patented three-dimensional X-Ray imaging technique, to more accurately detect subtle defects and manufacturing flaws, even as board complexities grow.

Military/Aerospace Test Systems & Instrumentation

Our expertise in the test and diagnosis of PCBs and subsystems has proven to be essential in supporting the ever-demanding military and aerospace markets. Our test solutions for these markets include high-performance systems, instruments and software solutions that manufacturers and repair depots all depend on to ensure the readiness of commercial and military avionics systems.

The swift pace of technological advances continues in the military and aerospace market, resulting in electronics assemblies of greater complexity, speed and accuracy. New programs from tactical aircraft to missile

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systems, as well as widespread enhancement programs, continue to fuel the demand for high performance test systems. We are a leading provider of test instrumentation and systems with performance well suited to the demands of military/aerospace electronics manufacturers and repair depots worldwide. Success in this market is illustrated by our penetration into major Department of Defense programs across all U.S. military service branches and many allied military services worldwide.

Diagnostic Solutions

Diagnostic Solutions provides electronic test and diagnostic systems to the automotive OEMs and their major subcontractors. The systems are used throughout the vehicle’s lifecycle from design through manufacture to after sale service and consist of highly integrated software and hardware components. As the number and complexity of electronic systems and embedded software proliferate in vehicles, the ability to manufacture and service those vehicles becomes increasingly dependent on electronic diagnostic equipment. Diagnostic Solutions’ products fall into two categories:

OEM Service Diagnostics

OEM dealer service technicians use Diagnostic Solutions systems to find faults in vehicles in use by their customers, and to reduce OEM warranty costs. Historically, the focus has been on fixing faults in the service bay, but is now growing to include constant monitoring of the vehicle to predict and prevent failure.

Vehicle Configuration and Test Solutions

Diagnostic Solutions’ VCATS ^™ products are used on automotive and major automotive subassembly production lines. Diagnostic Solutions’ VCATS connects to the vehicle to test and program or “configure” the electronic systems on vehicles. These vehicle electronic systems include engine control modules and subsystems such as braking, navigation and climate control. Diagnostic Solutions is also able to link to an OEM’s manufacturing control system in order to provide statistical quality reports to operators and management.

Both VCATS and OEM Service Diagnostics products utilize Diagnostic Solutions’ GRADE-X ^™ authoring software enabling the manufacturing and service phases of vehicle development. Diagnostics for electronic modules and systems used on vehicles of Diagnostic Solutions’ customers can be developed and written using the GRADE-X authoring software. The actual diagnosis of a customer’s vehicle occurs in the OEM dealer’s service bay utilizing a runtime portion of the software to facilitate the service and repair of the vehicle.

Broadband Test Systems

Broadband Test provides test systems for testing lines and qualifying lines for Digital Subscriber Line (“DSL”) telephone networks. As telephone companies deploy new technologies to provide “Triple Play” (voice, data, and video) services, the tasks of qualifying, installing, and maintaining subscriber service becomes more complex and costly. Our systems are used to support the delivery of responsive customer service while improving technician productivity.

Our products within the Broadband Test Systems market include:

4TEL ^™ Line Service Test System

Testing more than 130 million subscriber lines for many of the world’s largest telecommunications companies, our 4TEL line test service assurance system dramatically improves field repair productivity and reduces call center costs by quickly and accurately determining fault locations in the network and whether or not an expensive field dispatch is required.

Celerity ^™ DSL Test System

Telephone companies need to know which lines in their network are qualified for broadband DSL service before committing service to the consumer. Our patented Celerity system, in use on more than 60 million lines

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worldwide, uses accurate insertion loss, length and load coil detection, to quickly qualify lines for DSL service, enabling targeted marketing programs and low cost provisioning processes. Celerity also provides on-demand testing for in-service DSL lines to support quick fault isolation and efficient field repair dispatches.

Discontinued Operations

On November 30, 2005, our Connection Systems business was sold to Amphenol Corporation. This business designed and manufactured high-performance connection systems including backplane systems, printed circuit boards and high-speed, high-density connectors. Connection Systems has been reflected as a discontinued operation in the accompanying financial statements.

Summary of Net Revenue by Reportable Segment

Our three reportable segments accounted for the following percentages of consolidated net revenue for each of last three years:

Sales and Distribution

Prices for our systems can reach $2 million or more. In 2006, 2005, and 2004, no single customer accounted for more than 10% of our consolidated net revenue. In each of the years 2006, 2005, and 2004, our three largest customers in aggregate accounted for 18%, 18%, and 21% of consolidated net revenue, respectively.

Direct sales to United States government agencies accounted for less than 3% of consolidated net revenue in 2006 and 2005, and less than 2% in 2004. Approximately 23%, 22%, and 23% of Assembly Test Systems’ revenue in 2006, 2005 and 2004, respectively, was to United States government agencies and 20%, 26% and 24% of Assembly Test Systems’ revenue in 2006, 2005 and 2004, respectively, was to government contractor customers.

We have sales and service offices located throughout North America, Asia, and Europe, as our customers outside the United States are located primarily in these geographic areas. We sell in these areas predominantly through a direct sales force. Although we conduct some manufacturing activities outside the United States as detailed in “Item 2: Properties,” our manufacturing activities are primarily conducted in the United States.

Sales to customers outside the United States accounted for 77% of consolidated net revenue in 2006, 78% in 2005, and 79% in 2004. Sales to customers located in Singapore were 10%, 13%, and 16% of consolidated net revenue in 2006, 2005, and 2004, respectively. Sales to customers located in Taiwan were 14%, 12%, and 19% of consolidated net revenue in 2006, 2005 and 2004, respectively. Sales to customers located in Japan were 12%, 9% and 6% of consolidated net revenue in 2006, 2005 and 2004, respectively. Sales are attributed to geographic areas based on the location of the customer site.

See also “Item 1A: Risk Factors” and “Note F: Financial Instruments” in Notes to Consolidated Financial Statements.

Competition

We face significant competition throughout the world in each of our reportable segments. These competitors include, among others, Advantest Corporation, Verigy, Inc. (a new company spun out from Agilent

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Technologies, Inc.), Credence Systems Corporation, and LTX Corporation. Some of our competitors have substantially greater financial and other resources to pursue engineering, manufacturing, marketing and distribution of their products. We also face competition from internal suppliers at several of our customers. Some of our competitors have introduced or announced new products with certain performance characteristics which may be considered equal or superior to those we currently offer. We expect our competitors to continue to improve the performance of their current products and to introduce new products or new technologies that provide improved cost of ownership and performance characteristics. See also “Item 1A: Risk Factors.”

Backlog

At December 31, 2006 and 2005, our backlog of unfilled orders in each of our three reportable segments was as follows:

Of the backlog at December 31, 2006, approximately 96% of the Semiconductor Test Systems backlog, 95% of Assembly Test Systems backlog, and 98% of the Other Test Systems backlog is expected to be delivered in 2007.

Customers may delay delivery of products or cancel orders suddenly and without significant notice, subject to possible cancellation penalties. Due to possible customer changes in delivery schedules and cancellation of orders, our backlog at any particular date is not necessarily indicative of the actual sales for any succeeding period. Delays in delivery schedules and/or cancellations of backlog during any particular period could have a material adverse effect on our business, financial condition, and results of operations.

Raw Materials

Our products contain electronic and mechanical components that are provided by a wide range of suppliers. Certain of these components are standard products, while others are manufactured to our specifications. We can experience occasional delays in obtaining timely delivery of certain items. While the majority of our components are available from multiple suppliers, certain items are obtained from sole sources. We may experience a temporary adverse impact if any of our sole source suppliers delays or ceases to deliver products.

Intellectual Property and Licenses

Our development of our products, both hardware and software, is based in significant part on proprietary information, our brands and technology. We protect our rights in proprietary information, brands and technology through various methods, such as:

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However, these protections might not be effective in all circumstances. Competitors might independently develop similar technology or exploit our proprietary information and our brands in countries where we lack enforceable intellectual property rights or where enforcement of such rights through the legal system provides an insufficient deterrent. Also, intellectual property protections can lapse or be invalidated through appropriate legal processes. We do not believe that any single piece of intellectual property or proprietary rights is essential to our business.

Employees

As of December 31, 2006, we employed approximately 3,800 people. Since the inception of our business, we have experienced no work stoppages or other labor disturbances. We have no collective bargaining contracts.

Engineering and Development Activities

The highly technical nature of our products requires a large and continuing engineering and development effort. Engineering and development expenditures for the years ended December 31, 2006, 2005 and 2004 were $208.7 million, $223.0 million and $250.0 million, respectively. These expenditures amounted to approximately 15%, 21% and 18% of consolidated net revenue in 2006, 2005 and 2004, respectively.

Environmental Affairs

We are subject to various federal, state, and local government laws and regulations relating to the protection of employee health and safety and the environment. We accrue for all known environmental liabilities when it becomes probable that we will incur cleanup costs and those costs can reasonably be estimated. The amounts accrued do not cover sites that are in the preliminary stages of investigation. Estimated environmental costs are not expected to materially affect the financial position or results of our operations in future periods. However, estimates of future costs are subject to change due to protracted cleanup periods and changing environmental remediation laws and regulations.

In 2001, we were designated as a “potentially responsible party” (“PRP”) at a clean-up site in Los Angeles, California. This claim arose out of our acquisition of Perception Laminates, Inc. in August 2000. Prior to that date, Perception Laminates had itself acquired certain assets of Alco Industries, Inc. under an asset purchase agreement in 1992. Neither Teradyne nor Perception Laminates have ever conducted any operations at the Los Angeles site. We have asked the State of California to drop the PRP designation, but California has not yet agreed to do so.

In 2006, we received a general notice letter from the U.S. Environmental Protection Agency (“EPA”) which informed us that the EPA believes we are a de minimis PRP with respect to the Casmalia Disposal Site in California. We are currently waiting for further details from the EPA regarding the terms of the deminimis settlement offer that we expect to receive.

We believe that we have meritorious defenses against the above unsettled claims and intend to vigorously contest them. While it is not possible to predict or determine the outcomes of the unsettled claims or to provide possible ranges of losses that may arise, we believe the potential losses associated with all of these actions will not have a material adverse effect on our consolidated financial position or liquidity, but could possibly be material to our consolidated results of operations of any one period.

CEO Certification

An annual CEO certification was filed with the New York Stock Exchange by our CEO on June 22, 2006 in accordance with the New York Stock Exchange’s listing standards.

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OUR EXECUTIVE OFFICERS

Pursuant to General Instruction G(3) of Form 10-K, the following table is included as an unnumbered item in Part I of this Annual Report on Form 10-K in lieu of being included in the Proxy Statement for the Annual Meeting of Shareholders. The table sets forth the names of all of our executive officers and certain other information relating to their positions held with Teradyne and other business experience. Our executive officers do not have a specific term of office but rather serve at the discretion of the Board of Directors.

Risks Associated with Our Business

We are subject to intense competition.

We face significant competition throughout the world in each of our reportable segments. Some of our competitors have substantial financial and other resources to pursue engineering, manufacturing, marketing and distribution of their products. We also face competition from internal suppliers at several of our customers. Some of our competitors have introduced or announced new products with certain performance characteristics which

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may be considered equal or superior to those we currently offer. We expect our competitors to continue to improve the performance of their current products and to introduce new products or new technologies that provide improved cost of ownership and performance characteristics. New product introductions by competitors could cause a decline in revenues or loss of market acceptance of our products. Moreover, increased competitive pressure could lead to intensified price based competition, which could materially adversely affect our business, financial condition and results of operations.

Our business is dependent on the current and anticipated market for electronics, which historically has been highly cyclical.

Our business and results of operations depend in significant part upon capital expenditures of manufacturers of semiconductors and other electronics, which in turn depend upon the current and anticipated market demand for those products. The market demand for electronics is impacted by economic slowdowns. Historically, the electronics and semiconductor industry has been highly cyclical with recurring periods of over-supply, which often have had a severe negative effect on demand for test equipment, including systems we manufacture and market. We believe that the markets for newer generations of electronic products such as those that we manufacture and market will also be subject to similar fluctuations. We are dependent on the timing of orders from our customers, and the deferral or cancellation of previous customer orders could have an adverse effect on our results of operations. We cannot assure that the level of revenues or new orders for a calendar quarter will be sustained in subsequent quarters. In addition, any factor adversely affecting the electronics industry or particular segments within the electronics industry may adversely affect our business, financial condition and operating results.

Our operating results are likely to fluctuate significantly.

Our annual operating results are affected by a wide variety of factors that could materially adversely affect revenues and profitability.

The following factors are expected to impact future operations:

As a result of the foregoing and other factors, we have and may continue to experience material fluctuations in future operating results on a quarterly or annual basis which could materially and adversely affect our business, financial condition, operating results and stock price.

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We are subject to risks of operating internationally.

A significant portion of our total revenue is derived from customers outside the United States. Our international sales and operations are subject to significant risks and difficulties, including:

In addition, an increasing portion of our products and the products we purchase from our suppliers are sourced or manufactured in foreign locations, including China, and a large portion of the devices our products test are fabricated and tested by foundries and subcontractors in Taiwan, Singapore, China and other parts of Asia. As a result, we are subject to a number of economic and other risks, particularly during times of political or financial instability in these regions. Disruption of manufacturing or supply sources in these international locations could materially adversely impact our ability to fill customer orders and potentially result in lost business.

If we fail to develop new technologies to adapt to our customers’ needs and if our customers fail to accept our new products, our revenues will be adversely affected.

We believe that our technological position depends primarily on the technical competence and creative ability of our engineers. In a rapidly evolving market, such as ours, the development of new technologies, commercialization of those technologies into products and market acceptance and customer demand for those products are critical to our success. Successful product development, introduction and acceptance depend upon a number of factors, including:

If our suppliers do not meet product or delivery requirements, we could have reduced revenues and earnings.

Certain components, including semiconductor chips, may be in short supply from time to time because of high industry demand or the inability of some vendors to consistently meet our quality or delivery requirements. Approximately 30% of material purchases require some custom work where having multiple suppliers would be cost prohibitive. If any of our suppliers were to cancel contracts or commitments or fail to meet the quality or delivery requirements needed to satisfy customer orders for our products, we could lose time-sensitive customer orders and have significantly decreased revenues and earnings, which would have a material adverse effect on

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our business, results of operations and financial condition. In addition, we rely on contract manufacturers for certain subsystems used in our products, and our ability to meet customer orders for those products depends upon the timeliness and quality of the work performed by these subcontractors, over whom we do not exercise any control.

To a certain extent, we are dependant upon the ability of our suppliers and contractors to help meet increased product or delivery requirements. Many of our suppliers have implemented cost reduction strategies, just as we have, to address the slowdowns in the market. It may be difficult for these suppliers to meet delivery requirements in a period of rapid growth, therefore impacting our ability to meet our customers demands.

We rely on the financial strength of our suppliers. There can be no assurance that the loss of suppliers either as a result of financial viability, bankruptcy or otherwise will not have a material adverse effect on our business, results of operations or financial condition.

Our operations may be adversely impacted if our outsourced service providers fail to perform.

In an effort to increase efficiencies and decrease costs we have outsourced a number of our general and administrative functions, including information technology, to reputable service providers. In some cases, we have used service providers that we have historically used before but in other cases, service providers may be new to us. New relationships may initially increase the time for such service providers to learn our systems, policies and procedures and create difficulty in effectively implementing a fully outsourced solution. Many of our outsourced service providers are in foreign countries, sometimes impacting communication with them because of language and time difficulties. Their presence in foreign countries also increases the risk they could be exposed to political risk. Additionally, there may be difficulties encountered in coordinating the outsourced operations with existing functions and operations. If we fail in successfully coordinating and managing the outsourced service providers, it may cause an adverse affect on our operations which could result in a decline in our stock price.

We have significant guarantees and indemnification obligations.

From time to time we make guarantees to customers regarding the performance of our products and guarantee certain indebtedness, performance obligations or lease commitments of our subsidiary and affiliate companies. We also have agreed to provide indemnification to our officers, directors, employees and agents, to the extent permitted by law, arising from certain events or occurrences while the officer, director, employee or agent, is or was serving at our request in such capacity. If we become liable under any of these obligations, it could materially and adversely affect our business, financial condition and operating results. For additional information see “Note J: Commitments and Contingencies—Guarantees and Indemnification Obligations” in Notes to Consolidated Financial Statements.

We have taken measures to ensure that we are prepared to address slowdowns in the market for our products, which could have long-term negative effects on our business or impact our ability to adequately address a rapid increase in customer demand.

We have taken, and continue to take, measures to ensure that we are prepared to address slowdowns in the market for our products. These measures include reducing our workforce, the relocation of our headquarters to our North Reading, Massachusetts facility, real estate consolidation which resulted in closing and/or selling facilities, outsourcing general and administrative functions, discontinuing certain product lines, implementing material cost reduction programs and reducing planned capital expenditures and expense budgets. We cannot assure that the measures we have taken will not impair our ability to effectively develop and market products, to remain competitive in the industries in which we compete, to operate effectively, to operate profitably during slowdowns or to effectively meet a rapid increase in customer demand. These measures may have long-term negative effects on our business by reducing our pool of technical talent, decreasing or slowing improvements in

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our products, making it more difficult to hire and retain talented individuals and to quickly respond to customers or competitors in an upward cycle.

We may incur significant liabilities if we fail to comply with environmental regulations.

We are subject to both domestic and international environmental regulations and statutory strict liability relating to the use, storage, discharge, site cleanup and disposal of hazardous chemicals used in our manufacturing processes. If we fail to comply with present and future regulations, or are required to perform site remediation, we could be subject to future liabilities or the suspension of production. Present and future regulations may also:

Pursuant to present regulations and agreements, we are conducting groundwater and subsurface assessment and monitoring and are implementing remediation and corrective action plans for facilities located in California, Massachusetts and New Hampshire which are no longer conducting manufacturing operations. As of December 31, 2006, we have not incurred material costs as result of the monitoring and remediation steps taken at the California, Massachusetts and New Hampshire sites.

On January 27, 2003, the European Union adopted the following directives: (i) the directive on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (the “RoHS Directive”); and (ii) the directive on Waste Electrical and Electronic Equipment (the “WEEE Directive”). The WEEE Directive became effective August 13, 2005 and the RoHS Directive became effective on July 6, 2006. Both the RoHS Directive and the WEEE Directive alter the form and manner in which electronic equipment is imported, sold and handled in the European Union. Other jurisdictions, such as China, have followed the European Union’s lead in enacting legislation with respect to hazardous substances and waste removal. Ensuring compliance with the RoHS Directive, the WEEE Directive and similar legislation in other jurisdictions, and integrating compliance activities with our suppliers and customers could result in additional costs and disruption to operations and logistics and thus, could have a negative impact on our business, operations and financial condition.

We currently are and in the future may be subject to litigation that could have an adverse effect on our business.

From time to time, we may be subject to litigation or other administrative and governmental proceedings that could require significant management time and resources and cause us to incur expenses and, in the event of an adverse decision, pay damages in an amount that could have a material adverse effect on our financial position or results of operations.

For example, in connection with our August 2000 acquisition of each of Herco Technology Corp. and Perception Laminates, Inc., a complaint was filed on or about September 5, 2001 and is now pending, on appeal, before the U.S. Court of Appeals for the Ninth Circuit by the former owners of those companies naming as defendants Teradyne and two of our then executive officers. Additionally, in 2001, we were designated as a “potentially responsible party” at a clean-up site in Los Angeles, California. This claim also arises out of our acquisition of Perception Laminates in August 2000. Prior to that date, Perception Laminates had itself acquired certain assets of Alco Industries Inc. under an asset purchase agreement dated October 20, 1992. In 2006, we were also notified that we are a de minimis “potentially responsible party” with respect to the Casmalia Disposal Site in California. These matters are further described in “Item 3: Legal Proceedings.”

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If we are unable to protect our intellectual property, we may lose a valuable asset or may incur costly litigation to protect our rights.

We protect the technology that is incorporated in our products (“IP”) in several ways, including through patent, copyright, and trade secret protection and by contractual agreement. However, even with these protections, our IP may still be challenged, invalidated or subject to other infringement actions. While we believe that our IP has value in the aggregate, no single element of our IP is in itself essential. If a significant portion of our IP is invalidated or ineffective, our business could be materially adversely affected. In addition, we receive notifications from time to time that we may be in violation of patents held by others. An assertion of patent infringement against us, if successful, could have a material adverse effect on our ability to sell our products, or require a significant use of management resources and necessitate a lengthy and expensive defense which could adversely affect our operating results.

Our business may suffer if we are unable to attract and retain key employees.

Competition for employees with skills we require is intense in the high technology industry. Our success will depend on our ability to attract and retain key technical employees. The loss of one or more key or other employees, a decrease in our inability to attract additional qualified employees, or the delay in hiring key personnel could each have a material adverse effect on our business, results of operations or financial condition.

We may incur higher tax rates than we expect.

We are subject to paying income taxes in the United States and various other countries where we operate. Our effective tax rate is dependent on where our earnings are generated and the tax regulations and the interpretation and judgment of administrative tax or revenue entities in the United States and such other countries. We have pursued a global tax strategy which could adversely be affected by our failure to expand operations or earnings in certain countries, the mix of earnings and tax rates in the countries where we operate, changes to tax laws or an adverse tax ruling by administrative entities. We are also subject to tax audits in the countries where we operate. Any material assessment resulting from an audit from an administrative tax or revenue entity could also negatively affect our financial results.

Our business is impacted by worldwide economic cycles, which are difficult to predict.

Capital equipment providers in the electronics and semiconductor industries, such as Teradyne, have, in the past, been negatively impacted by sudden slowdowns in the global economies, and resulting reductions in customer capital investments. The duration of slowdowns in global economies and reductions in customer capital investments, which may adversely impact our business, are difficult to predict.

Acts of war, terrorist attacks and the threat of domestic and international terrorist attacks may adversely impact our business.

Acts of war and terrorist attacks may cause damage or disruption to our employees, facilities, customers, suppliers and distributors which could have a material adverse effect on our business, results of operation or financial condition. As we and our suppliers sell and manufacture products both in the United States and internationally, the threat of future terrorist attacks could lead to changes in security and operations at these locations which could increase our operating costs and which may adversely affect our business. Such conflicts may also cause damage or disruption to transportation and communication systems. We have completed some emergency preparedness planning and have a business continuity plan in case some of these events occur. However, we cannot be certain that our plans will be effective in the event of a disaster or other situation. All of these conditions make it difficult for us, and our customers, to accurately forecast and plan future business activities and could have a material adverse effect on our business, financial condition and results of operations.

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Provisions of our charter and by-laws and Massachusetts law make a takeover of Teradyne more difficult.

Our basic corporate documents and Massachusetts law contain provisions that could discourage, delay or prevent a change in control, even if a change in control might be regarded as beneficial to some or all of our stockholders.

We may acquire new businesses or form strategic alliances in the future, and we may not realize the benefits of such acquisitions.

We may acquire additional businesses, form strategic alliances or create joint ventures with third parties that we believe will complement or augment our existing businesses. If we acquire businesses with promising markets or technologies, we may not be able to realize the benefit of acquiring such businesses if we are unable to successfully integrate it with our existing operations and company culture. We may have difficulty in developing, manufacturing and marketing the products of a newly acquired company that enhances the performance of our combined businesses or product lines to realize value from expected synergies. We cannot assure that, following an acquisition, we will achieve the revenues or specific net income that justify the acquisition.

None.