The following discussion of our financial condition and results of operations should be read in conjunction with our Consolidated Financial Statements and the related notes included in Item 8, "Financial Statements and Supplementary Data," in this Annual Report on Form 10-K. This discussion contains forward-looking statements, which involve risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of certain factors, including but not limited to those discussed in Item 1A, "Risk Factors" and elsewhere in this Annual Report on Form 10-K. (See "Special Note Regarding Forward-Looking Statements.")
CRITICAL ACCOUNTING ESTIMATES AND POLICIES The preparation of our Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions in applying our accounting policies that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. We base these estimates and assumptions on historical experience, and evaluate them on an on-going basis to ensure that they remain reasonable under current conditions. Actual results could differ from those estimates. We discuss the development and selection of the critical accounting estimates with the Audit Committee of our Board of Directors on a quarterly basis, and the Audit Committee has reviewed our related disclosure in this Annual Report on Form 10-K. The items in our financial statements requiring significant estimates, judgments and assumptions are as follows:
Revenue Recognition. We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the selling price is fixed or determinable, and collectibility is reasonably assured. We derive revenue from three sources-sales of systems, spare parts and services.
We recognize revenue for system sales upon acceptance by the customer that the system has been installed and is operating according to predetermined specifications. Under certain circumstances, however, we recognize revenue prior to acceptance from the customer, as follows:
• When the customer fab has previously accepted the same tool, with the same specifications, and it can be objectively demonstrated that the tool meets all of the required acceptance criteria upon shipment, revenue is recognized upon shipment. The portion of revenue associated with installation is deferred based on estimated fair value, and that revenue is recognized upon completion of the installation.

• When system sales to independent distributors have no installation requirement, contain no acceptance agreement, and 100% payment is due based upon shipment, revenue is recognized upon shipment.

• When the installation of the system is deemed perfunctory, revenue is recognized upon shipment. The portion of revenue associated with installation is deferred based on estimated fair value, and that revenue is recognized upon completion of the installation.

• When the customer withholds acceptance due to issues unrelated to product performance, revenue is recognized when the system is performing as intended and meets all published and agreed-upon specifications.

• When the system is damaged during transit and title has passed to the customer, revenue is recognized upon receipt of cash payment from the customer.

We enter into sales arrangements that may consist of multiple deliverables of our products and services where certain elements of the sales arrangement are not delivered and accepted in one reporting period. Judgment is required to properly identify the accounting units of the multiple deliverable transactions and to determine the manner in which revenue should be allocated among the accounting units. Additionally, judgment is required to interpret various commercial terms and determine when all criteria of revenue recognition have been met in order for revenue recognition to occur in the appropriate accounting period. While changes in the allocation of the estimated selling price between the accounting units will not affect the amount of total revenue recognized for a particular arrangement, any material changes in these allocations could impact the timing of revenue recognition, which could have a material effect on our financial position and results of operations.
Trade-in rights are occasionally granted to customers to trade in tools in connection with subsequent purchases. We estimate the value of the trade-in right and reduce the revenue recognized on the initial sale. This amount is recognized at the earlier of the exercise of the trade-in right or the expiration of the trade-in right.
Spare parts revenue is recognized when the product has been shipped, risk of loss has passed to the customer and collection of the resulting receivable is probable.

Service and maintenance contract revenue is recognized ratably over the term of the maintenance contract. Revenue from services performed in the absence of a maintenance contract, including consulting and training revenue, is recognized when the related services are performed and collectibility is reasonably assured.
We sell stand-alone software that is subject to the software revenue recognition guidance. We periodically review selling prices to determine whether vendor-specific objective evidence ("VSOE") exists, and in some situations where we are unable to establish VSOE for undelivered elements such as post-contract service, revenue is recognized ratably over the term of the service contract. We also defer the fair value of non-standard warranty bundled with equipment sales as unearned revenue. Non-standard warranty includes services incremental to the standard 40-hour per week coverage for twelve months. Non-standard warranty is recognized ratably as revenue when the applicable warranty term period commences.
The deferred system profit balance equals the amount of deferred system revenue that was invoiced and due on shipment, less applicable product and warranty costs. Deferred system revenue represents the value of products that have been shipped and billed to customers which have not met our revenue recognition criteria. Deferred system profit does not include the profit associated with product shipments to customers in Japan, to whom title does not transfer until customer acceptance. Shipments to customers in Japan are classified as inventory at cost until the time of acceptance.
Inventories. Inventories are stated at the lower of cost (on a first-in, first-out basis) or market. Demonstration units are stated at their manufacturing cost and written down to their net realizable value. Our manufacturing overhead standards for product costs are calculated assuming full absorption of forecasted spending over projected volumes, adjusted for excess capacity. Abnormal inventory costs such as costs of idle facilities, excess freight and handling costs, and spoilage are recognized as current period charges. We write down product inventory based on forecasted demand and technological obsolescence and parts inventory based on forecasted usage and customer support requirements. These factors are impacted by market and economic conditions, technology changes, new product introductions and changes in strategic direction and require estimates that may include uncertain elements. Actual demand may differ from forecasted demand, and such differences may have a material effect on recorded inventory values.
Warranty. We provide standard warranty coverage on our systems for 40 hours per week for twelve months, providing labor and parts necessary to repair the systems during the warranty period. We account for the estimated warranty cost as a charge to costs of revenues when revenue is recognized. The estimated warranty cost is based on historical product performance and field expenses. Utilizing actual service records, we calculate the average service hours and parts expense per system and apply the actual labor and overhead rates to determine the estimated warranty charge. We update these estimated charges on a quarterly basis. The actual product performance and/or field expense profiles may differ, and in those cases we adjust our warranty accruals accordingly. See Note 12, "Commitments and Contingencies" to the Consolidated Financial Statements for a detailed description.
Allowance for Doubtful Accounts. A majority of our trade receivables are derived from sales to large multinational semiconductor manufacturers throughout the world. In order to monitor potential credit losses, we perform ongoing credit evaluations of our customers' financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon our assessment of the expected collectibility of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance. We take into consideration (1) any circumstances of which we are aware of a customer's inability to meet its financial obligations; and (2) our judgments as to prevailing economic conditions in the industry and their impact on our customers. If circumstances change, such that the financial conditions of our customers are adversely affected and they are unable to meet their financial obligations to us, we may need to record additional allowances, which would result in a reduction of our net income.
Stock-Based Compensation. We account for stock-based awards granted to employees for services based on the fair value of those awards. The fair value of stock-based awards is measured at the grant date and is recognized as expense over the employee's requisite service period. The fair value is determined using a Black-Scholes valuation model for stock options and for purchase rights under our Employee Stock Purchase Plan and using the closing price of our common stock on the grant date for restricted stock units. The Black-Scholes option-pricing model requires the input of assumptions, including the option's expected term and the expected price volatility of the underlying stock. The expected stock price volatility assumption is based on the market-based implied volatility from traded options of our common stock.

Contingencies and Litigation. We are subject to the possibility of losses from various contingencies. Considerable judgment is necessary to estimate the probability and amount of any loss from such contingencies. An accrual is made when it is probable that a liability has been incurred or an asset has been impaired and the amount of loss can be reasonably estimated. We accrue a liability and recognize as expense the estimated costs expected to be incurred over the next twelve months to defend or settle asserted and unasserted claims existing as of the balance sheet date. See Item 3, "Legal Proceedings" and Note 12, "Commitments and Contingencies" to the Consolidated Financial Statements for a detailed description.
Goodwill and Intangible Assets. We assess goodwill for impairment annually as well as whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Long-lived intangible assets are tested for recoverability whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. See Note 5, "Goodwill and Purchased Intangible Assets" to the Consolidated Financial Statements for a detailed description. Goodwill represents the excess of the purchase price over the fair value of the net tangible and identifiable intangible assets acquired in each business combination. We performed a qualitative assessment of the goodwill by reporting unit as of November 30, 2011 during the three months ended December 31, 2011 and concluded that there was no impairment. There have been no significant events or circumstances affecting the valuation of goodwill subsequent to the impairment test performed in the three months ended December 31, 2011. The next annual evaluation of the goodwill by reporting unit will be performed in the three months ending December 31, 2012.
If we were to encounter challenging economic conditions, such as a decline in our operating results, an unfavorable industry or macroeconomic environment, a substantial decline in our stock price, or any other adverse change in market conditions, we may be required to perform the two-step quantitative goodwill impairment analysis. In addition, if such conditions have the effect of changing one of the critical assumptions or estimates we use to calculate the value of our goodwill or intangible assets, we may be required to record goodwill and/or intangible asset impairment charges in future periods, whether in connection with our next annual impairment assessment in the second quarter of fiscal year 2013 or prior to that, if any triggering event occurs outside of the quarter during which the annual goodwill impairment assessment is performed. It is not possible at this time to determine if any such future impairment charge would result or, if it does, whether such charge would be material to our results of operations.
Income Taxes. We account for income taxes in accordance with the authoritative guidance, which requires that deferred tax assets and liabilities be recognized using enacted tax rates for the effect of temporary differences between the book and tax bases of recorded assets and liabilities. The guidance also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that a portion of the deferred tax asset will not be realized. We have determined that a valuation allowance was necessary against a portion of the deferred tax assets, but we anticipate that our future taxable income will be sufficient to recover the remainder of our deferred tax assets. However, should there be a change in our ability to recover our deferred tax assets, we could be required to record a valuation allowance against our deferred tax assets. This would result in an increase to our tax provision in the period in which we determine that the recovery is not probable.
On a quarterly basis, we provide for income taxes based upon an estimated annual effective income tax rate. The effective tax rate is highly dependent upon the geographic composition of worldwide earnings, tax regulations governing each region, availability of tax credits and the effectiveness of our tax planning strategies. We carefully monitor the changes in many factors and adjust our effective income tax rate on a timely basis. If actual results differ from these estimates, this could have a material effect on our financial condition and results of operations.
In addition, the calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax regulations. In accordance with the authoritative guidance on accounting for uncertainty in income taxes, we recognize liabilities for uncertain tax positions based on the two-step process prescribed within the interpretation. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained in audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. We reevaluate these uncertain tax positions on a quarterly basis. This evaluation is based on factors including, but not limited to, changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any change in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision.
Valuation of Marketable Securities. Our investments in available-for-sale securities are reported at fair value. Unrealized gains related to increases in the fair value of investments and unrealized losses related to decreases in the fair value are included in accumulated other comprehensive income (loss), net of tax, as reported on our Consolidated Statements of Stockholders' Equity. However, changes in the fair value of investments impact our net income only when such investments are sold or impairment is recognized. Realized gains and losses on the sale of securities are determined by specific identification of the security's cost basis. We periodically review our investment portfolio to determine if any investment is other-than-temporarily impaired due to changes in credit risk or other potential valuation concerns, which would require us to record an

impairment charge in the period any such determination is made. In making this judgment, we evaluate, among other things, the duration of the investment, the extent to which the fair value of an investment is less than its cost, the credit rating and any changes in credit rating for the investment, default and loss rates of the underlying collateral, structure and credit enhancements to determine if a credit loss may exist. Our assessment that an investment is not other-than-temporarily impaired could change in the future due to new developments or changes in our strategies or assumptions related to any particular investment.
Effects of Recent Accounting Pronouncements In December 2011, the Financial Accounting Standards Board ("FASB") issued an accounting standard update requiring enhanced disclosure about certain financial instruments and derivative instruments that are offset in the balance sheet or subject to an enforceable master netting arrangement or similar agreement. The disclosure requirement becomes effective retrospectively in the first quarter of our fiscal year ending June 30, 2014. We do not expect that the requirement will have an impact on our financial position, results of operations or cash flows as it is disclosure-only in nature.
In September 2011, the FASB issued an accounting standard update intended to simplify testing goodwill for impairment. The amendment allows an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. An entity will no longer be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment, that it is more likely than not that the fair value of the reporting unit is less than its carrying amount. The amendment becomes effective for annual and interim goodwill impairment tests performed for our fiscal year ending June 30, 2013, and early adoption is permitted. We elected to early adopt this accounting guidance at the beginning of the three months ended December 31, 2011 (see Note 5, "Goodwill and Purchased Intangible Assets," to the Condensed Consolidated Financial Statements for a detailed description).
In June 2011, the FASB issued an accounting standard update requiring an increase in the prominence of items reported in other comprehensive income. The amendment eliminates the option to present components of other comprehensive income as part of the statement of changes in stockholders' equity and requires that the total of comprehensive income, the components of net income, and the components of other comprehensive income be presented in a single continuous statement of comprehensive income or in two separate but consecutive statements. The amendment also required presentation of adjustments for items that are reclassified from other comprehensive income in the statement where the components of net income and the components of other comprehensive income are presented, which was indefinitely deferred by the FASB in December 2011. The amendment (other than the portion regarding the presentation of reclassification adjustments which, as noted above, has been deferred indefinitely) becomes effective during the first quarter of our fiscal year ending June 30, 2013. Early adoption is permitted. The amendment will impact the presentation of the financial statements but will not have an impact on our financial position, results of operations or cash flows.
In May 2011, the FASB issued an accounting standard update providing guidance on achieving a consistent definition of and common requirements for measurement of fair value between U.S. GAAP and International Financial Reporting Standards ("IFRS"). This amendment was effective prospectively for our interim reporting period ended March 31, 2012. Early application is not permitted. The amendment did not have an impact on our financial position, results of operations or cash flows.
In April 2010, the FASB amended its guidance on share-based payment awards denominated in certain currencies. The amendment clarifies that an employee share-based payment award with an exercise price denominated in the currency of a market in which a substantial portion of the entity's equity securities trades should not be considered to contain a condition that is not a market, performance or service condition. Therefore, an entity would not classify such an award as a liability if it otherwise qualifies as equity. This amendment was effective for our interim reporting period ended September 30, 2011. The amendment did not have an impact on our financial position, results of operations or cash flows.
In January 2010, the FASB issued authoritative guidance for fair value measurements. This guidance now requires a reporting entity to disclose separately the amounts of significant transfers in and out of Level 1 and Level 2 fair value measurements and also to describe the reasons for these transfers. This authoritative guidance also requires enhanced disclosure of activity in Level 3 fair value measurements. The guidance for Level 1 and Level 2 fair value measurements was effective for our interim reporting period ended March 31, 2010. The implementation did not have an impact on our financial position, results of operations or cash flows as it is disclosure-only in nature. The guidance for Level 3 fair value measurements disclosures was effective for our interim reporting period ended September 30, 2011, and the implementation of that guidance did not have an impact on our financial position, results of operations or cash flows as it is disclosure-only in nature.

EXECUTIVE SUMMARY
KLA-Tencor Corporation is a leading supplier of process control and yield management solutions for the semiconductor and related nanoelectronics industries. Our broad portfolio of products and services primarily supports integrated circuit ("IC" or "chip") manufacturers throughout the entire semiconductor fabrication process, from research and development to final volume production. We provide leading-edge equipment, software and support that enable IC manufacturers to identify, resolve and manage significant advanced technology manufacturing process challenges and obtain higher finished product yields at lower overall cost. In addition to serving the semiconductor industry, we also provide a range of technology solutions to a number of other high technology industries, including the light emitting diode ("LED"), data storage and photovoltaic industries, as well as general materials research. Our products and services are used by the vast majority of bare wafer, IC, lithography reticle ("reticle" or "mask") and disk manufacturers in the world. Our products, services and expertise are used by our customers to measure and control nanometric-level manufacturing processes, and to detect, analyze and resolve critical product defects that arise in that environment. Our revenues are driven largely by our customers' spending on capital equipment and related maintenance services necessary to support key transitions in their underlying product technologies, or to increase their production volumes in response to market demand. Our semiconductor customers generally operate in one or more of the three major semiconductor markets -- memory, foundry and logic. All three of these markets are characterized by rapid technological changes and sudden shifts in end-user demand, which influence the level and pattern of our customers' spending on our products and services. Although capital spending in all three semiconductor markets has historically been very cyclical, the demand for more advanced and lower cost chips used in a growing number of consumer electronics, communications, data processing, and industrial and automotive products has resulted in favorable long-term revenue growth rates for our process control and yield management solutions.
As a supplier to the global semiconductor and semiconductor-related industries, we are subject to the cyclical capital spending that characterizes these industries. The timing, length, intensity and volatility of capacity-oriented capital spending cycles of our customers are unpredictable. In addition, our customer base continues to become more highly concentrated over time, thereby increasing the potential impact of a sudden change in capital spending by a major customer on our revenues and profitability.
The growing use of increasingly sophisticated semiconductor devices has caused many of our customers to invest in additional semiconductor manufacturing capabilities and capacity. These investments have included process control and yield management equipment and services and have had a significant favorable impact on our revenues.
During the fiscal years ended June 30, 2012 and 2011, our revenues and earnings remained robust compared to the prior several fiscal years as we responded to meet the high level of customer demand for our products, driven by the strong growth in the consumer mobile device markets. Our revenue levels in the next fiscal year will depend upon whether our customers maintain these elevated levels of investment in process control equipment. In addition to our revenue levels, our earnings for the next fiscal year will also depend on the amount of research and development spending that we embark upon in meeting our customers' technology roadmaps. We cannot predict the duration and sustainability of these favorable business conditions. We have increased our production volumes and capacity to meet anticipated customer requirements and remain at risk of incurring significant inventory-related and other restructuring charges, if business conditions deteriorate. We believe that, over the long term, our customers will continue to invest in advanced technologies and new materials to enable smaller design rules and higher density applications, as well as to reduce cost. We expect that this in turn will drive long-term increased adoption of process control equipment and services that reduce semiconductor defectivity and improve manufacturing yields, reinforcing the longer-term growth drivers in our industry.

The following table sets forth some of our key consolidated financial information for each of our last three fiscal years:

                                           Year ended June 30,
(Dollar amounts in thousands)     2012            2011            2010
Total revenues                $ 3,171,944     $ 3,175,167     $ 1,820,760
Costs of revenues             $ 1,330,016     $ 1,259,243     $   815,662
Gross margin percentage                58 %            60 %            55 %
Net income                    $   756,015     $   794,488     $   212,300
Diluted income per share      $      4.44     $      4.66     $      1.23

The results for the fiscal year ended June 30, 2012 reflected favorable conditions we encountered as our customers, particularly the foundries, invested . . .