factors relating to the assumptions, risks and uncertainties inherent with the application of the proportional performance method of accounting affects the amounts of revenues and related expenses reported in our consolidated financial statements. A number of internal and external factors can affect our estimates, including labor rates, utilization and efficiency variances and specification and testing requirement changes.

On Demand is comprised of Oracle On Demand and Advanced Customer Services and is a part of our services business. Oracle On Demand services are offered as standalone arrangements or as a part of arrangements to customers buying new software licenses or hardware systems products and services. Our On Demand services provide multi-featured software and hardware management and maintenance services for our software and hardware systems products delivered at our data center facilities, select partner data centers or customer facilities. Advanced Customer Services provide customers with services to architect, implement and manage customer IT environments including software and hardware systems product management services, industry-specific solution support centers and remote and on-site expert services. Depending upon the nature of the arrangement, revenues from On Demand services are recognized as services are performed or ratably over the term of the service period, which is generally one year or less.

Education revenues are a part of our services business and include instructor-led, media-based and internet-based training in the use of our software and hardware products. Education revenues are recognized as the classes or other education offerings are delivered.

If an arrangement contains multiple elements and does not qualify for separate accounting for the product and service transactions, then new software license revenues and/or hardware systems products revenues, including the costs of hardware systems products, are generally recognized together with the services based on contract accounting using either the percentage-of-completion or completed-contract method. Contract accounting is applied to any bundled software, hardware systems and services arrangements: (1) that include milestones or customer specific acceptance criteria that may affect collection of the software license or hardware systems product fees; (2) where consulting services include significant modification or customization of the software or hardware systems product; (3) where significant consulting services are provided for in the software license contract or hardware systems product contract without additional charge or are substantially discounted; or (4) where the software license or hardware systems product payment is tied to the performance of consulting services. For the purposes of revenue classification of the elements that are accounted for as a single unit of accounting, we allocate revenues to software and nonsoftware elements based on a rational and consistent methodology utilizing our best estimate of fair value of such elements.

We also evaluate arrangements with governmental entities containing “fiscal funding” or “termination for