Software Effort Estimation Using Early COSMIC to Substitute Use Case Weight

Abstract

In the size estimation software, there are many methods that have proven their reliability. One of them is Use Case Points (UCP). UCP has a well-known advantage based on the use case scenario which is a reformation of the user story in the software requirements specification (SRS) document. However, UCP also has several weaknesses, including the use case is a summary of the user story. User stories often do not reveal detailed data. Therefore, the potential ambiguity of the use case must be watched by a business/system analyst. On the other hand, there is an international association called COSMIC, which has developed a global standard for calculating the size of the software namely ISO/IEC 19761. The COSMIC model begins with a user story which is then carried out cascade to sequence diagrams to make an engagement between process/method flow and data. The purpose of this study is to substitute the use case weight of the pure UCP method, to become a COSMIC functional size unit (Cfsu). Then, the estimation results of the two are compared with the actual effort. The case study used as a comparison of the COSMIC and UCP methods is the Hair Salon Online Booking Application. From this study the results obtained are the deviation between the results of the original UCP estimate (keep use case weight) of the actual effort is 76.85 percent. As for software effort estimation using early COSMIC is 92.67 percent against the actual effort.