There are several characteristics that account for the flexibility which drives the popularity and usage of the function point methodology, but the foremost appeal is the ability to measure the size of any software deliverable in logical, user oriented terms. All sizing is based upon identifying, evaluating and weighting functional entities (inputs, outputs, inquiries and data usage) in an application or project from a user perspective. The term user is defined to be any person and/or thing that interacts with the software. Clearly, the user could even be another system or even a machine. By applying this approach, function points can be universally applied regardless of platform, environment, language, or other technical considerations.