Mature, Valid, Consistent
Functional size measurement is an important basis for measuring productivity and for estimating effort for software activities. The COSMIC Functional Sizing Methodology is the mature standard for software size measurement, it has remain largely unchanged since 1998. It is based on fundamental software principles, and is therefore suited to all types of software. The method was developed by a team of experts and builds on the original functional size measurement methodologies. The COSMIC Sizing methodology became an ISO standard in 2003.