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For certain professional services, we have established VSOE as a consistent number of standalone sales of this deliverable have been priced within a reasonably narrow range. We have not established VSOE for our subscription services due to lack of pricing consistency, the introduction of new services and other factors. Accordingly, we use our BESP to determine the relative selling price.
We determined BESP by considering our overall pricing objectives and market conditions. Significant pricing practices taken into consideration include our discounting practices, the size and volume of our transactions, the customer demographic, the geographic area where our services are sold, our price lists, our go-to-market strategy, historical standalone sales and contract prices. The determination of BESP is made through consultation with and approval by management, taking into consideration the go-to-market strategy. As our go-to-market strategies evolve, we may modify our pricing practices in the future, which could result in changes in relative selling prices, including both VSOE and BESP. Deferred Revenue. The deferred revenue balance does not represent the total contract value of annual or multi-year, non-cancelable subscription agreements. Deferred revenue primarily consists of billings or payments received in advance of revenue recognition from subscription service described above and is recognized as the revenue recognition criteria are met. We generally invoice customers in annual or quarterly installments. Deferred revenue is influenced by several factors, including seasonality, the compounding effects of renewals, invoice duration, invoice timing and new business linearity within the quarter.
Deferred revenue that will be recognized during the succeeding twelve month period is recorded as current deferred revenue and the remaining portion is recorded as noncurrent.
Deferred Commissions. We defer commission payments to our direct sales force. The commissions are deferred and amortized to sales expense over the non-cancelable terms of the related subscription contracts with our customers, which are typically 12 to 36 months. The commission payments, which are paid in full the month after the customer's service commences, are a direct and incremental cost of the revenue arrangements. The deferred commission amounts are recoverable through the future revenue streams under the non-cancelable customer contracts. We believe this is the preferable method of accounting as the commission charges are so closely related to the revenue from the non-cancelable customer contracts that they should be recorded as an asset and charged to expense over the same period that the subscription revenue is recognized. During the six months ended
July 31, 2013, we deferred $62.8 millionof commission expenditures and we amortized $91.9 millionto sales expense. During the same period a year ago, we deferred $67.3 millionof commission expenditures and we amortized $72.0 millionto sales expense. Deferred commissions on our condensed consolidated balance sheets totaled $225.4 millionat July 31, 2013and $254.4 millionat January 31, 2013.