The success of a software development project depends on that the retrieved product complies with the user’s specifications and to be completed within the time and within the budget established. Many projects fail when they are not being developed within the time set due to a bad assessment of the effort or duration of the software project. In this article is presented the results of a literature review about the factors that affect the precision of the use case points method. A total of 37 primarily studies were selected. The results show that the environmental factors, the use cases complexity, the lack of use case standardization, technical factors and counting transactions are some factors that affect the use of the use case points method.