| Solving the crisis of software need more management mesure than technology mesure.But software project management bases on estimating of the software size .So the size estimating is important to solving the crisis of software.Now the size estimating methods such as coding lines, function points analysis and prognosticate object points are popular in software industry, they have their respective advantages and shortages, but no one can make a satisfying result of size estimating.In the time of OO(object-oriented) developing method and UML very popular,OO software size estimating is very undeveloped.This article according to the relation of size measurement and size estimating finds a size estimating method of OO software in the begin phase of requirement analysis after researching the process of OO software developing.And this method names Object Points Method Based on Use Cases,can be combined with the case tool--Microsoft Visio 2003,then make it possible to develop an aid-tool for this method by utilizing the technology of Java and UML.According to the guide line of software measurement and the tradition of OO software measurement, the article finds the measurement elements, combines with the TIPS project, shows software size impacting of every element, then designs the estimating formula and steps of Object Points Method Based on Use Cases and testifies it from theory and practice.In the process of developing large size software it is difficult to estimate software size manually by using Object Points Method Based on Use Cases, so the writer develops an aid-tool. Input use cases diagram and the errors of every pair of bottom use case and actor, the tool can make out object points automatically.To prove that this method is advanced, the writer contrasts this method with other software size estimating methods, draws a conclusion that the Object Points Method Based on Use Cases has more maneuverability and veracity than other Methods. |
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