Functional Size Measurement based on Problem Frames: a Case Study

The approach to requirements modelling based on problem frames is gaining increasing attention and popularity. However, the usage of problem frames in industrial software development processes requires that some industrial practices, like cost estimation, are supported. This paper explores the possibility to apply the most popular functional measurement method, namely Function Point Analysis, to user requirements represented using problem frames. In particular, a simple problem is modelled using problem frames –both in their native notation and using UML– and its functional size in Function Points is measured. This case study indicates that it is actually possible to apply Function Point Analysis to problem frames, and provides some insight into the measurement process to be adopted.