早期软件规模度量指南 – 专家级

Expert guideline for early sizing with COSMIC (Chinese)

Vogelezang, F.W.

In practice, it is sometimes sufficient or necessary to approximate a functional size:
• when a size is needed, but there is insufficient time or resources to measure using the standard method;
• early in the life of a project, before the Functional User Requirements (FUR) have been specified down to the level of detail where the accurate size measurement is possible;
• when the quality of the documentation of the actual requirements is not good enough for accurate measurement.
The intended audience for this document is for those who need to establish the size of a piece of software without time or details available to use the standard COSMIC method.

This document describes reasons why it may be necessary to approximate, how actual requirements are often expressed at varying levels of documentation and some general principles of how to recognise and apply approximation techniques.