impact on our results of operations and financial position.

 

Stock-Based Compensation

 

We currently measure compensation expense for our stock-based incentive programs using the intrinsic value method prescribed by Accounting Principles Board Opinion No. 25, Accounting for Stock Issued to Employees. Under this method, we do not record compensation expense when stock options are granted to eligible participants as long as the exercise price is not less than the fair market value of the stock when the option is granted. We also do not record compensation expense in connection with our Employee Stock Purchase Plan as long as the purchase price of the stock is not less than 85% of the lower of the fair market value of the stock at the beginning of each offering period or at the end of each purchase period. In accordance with FASB Statement No. 123, Accounting for Stock-Based Compensation , and FASB Statement No. 148, Accounting for Stock-Based Compensation—Transition and Disclosure , we disclose our pro forma net income or loss and net income or loss per share as if the fair value-based method had been applied in measuring compensation expense for our stock-based incentive programs. We have elected to follow Opinion 25 because the fair value accounting provided for under Statement 123 requires the use of option valuation models that were not developed for use in valuing incentive stock options and employee stock purchase plan shares.

 

On December 16, 2004, the FASB issued Statement No. 123 (revised 2004), Share-Based Payment , which is a revision of Statement 123. Statement 123(R) generally requires share-based payments to employees, including grants of employee stock options and purchases under employee stock purchase plans, to be recognized in the statement of operations based on their fair values. This standard is effective for public companies for fiscal years beginning after June 15, 2005. We expect to adopt this new standard at the beginning of our fiscal year ending May 31, 2007 using the modified prospective method.

 

Allowances for Doubtful Accounts and Returns

 

We make judgments as to our ability to collect outstanding receivables and provide allowances for the portion of receivables when collection becomes doubtful. Provisions are made based upon a specific review of all significant outstanding invoices. For those invoices not specifically reviewed, provisions are recorded at differing rates, based upon the age of the receivable. In determining these percentages, we analyze our historical collection experience and current economic trends. If the historical data we use to calculate the allowance for doubtful accounts does not reflect the future ability to collect outstanding receivables, additional provisions for doubtful accounts may be needed and the future results of operations could be materially affected.

 

We also record a provision for estimated sales returns and allowances on product and service related sales in the same period the related revenues are recorded. These estimates are based on historical sales returns, analysis of credit memo data and other known factors. If the historical data we use to calculate