That is, the process is decomposed in a relatively small set of tasks and the effort necessary to carry through each task is estimado' ' As well as in the technique based on the problem, the estimate based on the process starts with the delineation of the functions of software from the target of the project. After that, for the development of each function she is necessary to attribute the execution of a series of activities (communication with the customer, planning, analysis of risk, engineering and construction/delivery). (PAGNO, 2010). After the attribution of activities, the planner of the project consults given historical of the team and esteem the effort/necessary cost for each involved activity. Combining the functions of the problem with the involved activities of the process, the estimates of size and necessary effort for the accomplishment of each activity of the software process are carried through, and as last step, the estimates for each function of software are carried through.
(PRESSMAN, 2006). Resumidamente, the size and/or demanded total effort for the conclusion of the project is given by the addition of the effort necessary to execute all the activities of each function, followed of the addition of the size and effort of all the functions of software. (PAGNO, 2010). 2.1.3 ESTIMATE WITH USE CASES the method Points for Case of Uso (PCU) was considered by Gustav Karner, in 1993, it allows esteem the size of a project on the basis of use cases, considering the complexity of the actions and an analysis of high level of the steps executed in each task. (RASP, 2007). According to Pressman (2006), one is about one used technique esteem costs of projects of software Guided Objects, on the basis of the model of cases of use generated at the beginning of the project. Dekkers (1999) apud Andrade and Oliveira (2004), affirms that the boarding based on Points of Cases of Uso (PCU) allows to make estimates of the project at the beginning on the basis of the model of use cases.