Design of a Fuzzy Decision-Making Model and Its Application to Software Functional Size Measurement

COSMIC-FFP as a Functional Size Measurement method has greatly improved the estimation of realtime software system. Based on math expectation and variance, this paper puts forward the concepts of fuzzy expectation and fuzzy variance. And then the fuzzy regression analysis is formed on the basis of these concepts. The effort estimation decision-making model, which can determine regression frequency according to actual needs, is established based on this fuzzy regression analysis. This effort estimation decisionmaking model can also make the disturbance of morbid data and bad information in regression analysis to the decision result decrease bit by bit until we are satisfied. When applying this estimation model to software metrics of COSMIC-FFP, we can estimate the effort accurately, which leads to a correct decision.