Based On Use Case Software Size Estimation Model

Use cases and Use case models describe the functional requirements of a future software system, so it is possible to estimate the size of system by measuring the size or complexity of the use case or use case models. This thesis proposes the Size Estimate Model based on use case, which includes: improved use case points method, the size estimation process model and the supported tool, based on use case through studying the use case and use case point method. Improved Use Case Point Method, using Use Case as input, estimates the size of System as viewed from user. And it is so easy that people could use it to estimate the size of System in a little time. The Process Model based Use Case, whose kernel is Improved Use Case point method, includes four stages: Requirement, Size Estimation, Inspect and Improve, Analysis and Summarize. The process provides the guidance of capturing, writing and organizing the Use Case, and estimating size, constructing and optimizing the relation function of size and effort, etc. The supported tool is designed in term of process completely. It is so convenient for people to use the Improved Use Case Point method to size the System that improves the practicability of model. The Purpose of this thesis is to improve the size estimate capability of Software develop group by using the Model, and provide the well foundation for schedule and cost estimation, provide the guarantee for software quality assurance.