4. Revenue Recently Adopted Accounting Pronouncements In October 2009, the Financial Accounting Standards Board ( FASB ) issued authoritative guidance for the accounting of multiple-deliverable revenue arrangements, which establishes the accounting and reporting guidance for arrangements including multiple revenue-generating activities. This new authoritative guidance for arrangements with multiple deliverables requires that arrangement consideration be allocated at the inception of an arrangement to all deliverables using the relative selling price method. It also establishes a selling price hierarchy for determining the selling price of each deliverable. The new guidance also eliminates the residual method of allocation for multiple-deliverable revenue arrangements that are outside the scope of software revenue recognition guidance. In October 2009, the FASB also issued authoritative guidance for the accounting of certain revenue arrangements that include software elements, which changes the accounting model for revenue arrangements that include both tangible products and software elements that are  essential to the functionality  of the tangible products, and excludes these products from the software revenue accounting guidance. We adopted the new guidance on revenue recognition in the first quarter of 2011 on a prospective basis for applicable revenue arrangements originating or materially modified on or after January 1, 2011. The impact of the adoption of the new revenue recognition guidance is to accelerate the timing of revenue recognition principally related to partial shipments of hardware products at the end of accounting periods, which impact may vary from period to period. In periods prior to the adoption of the new guidance, the revenue related to partial shipments of our hardware products which were sold with software deliverables was deferred under the software revenue recognition guidance until the shipment or delivery of all items of a multiple element arrangement had occurred, other than the del