What kind of projects are Use Case Diagrams being used on?
Figure 1 shows us that UML diagrams are being used on non-trivial projects. Note that the average number of Use Cases per project is 88. This is a lot of information to convey, and it would seem beneficial to provide a Use Case Model that contains Use Case diagrams to help describe the behavior of a system this size. In addition, tools today provide the ability to map traceability between Use Cases and Classes to ensure the solution delivered is meeting the end goals of the user. Furthermore, as requirements change (as they often do), being able to know how many classes are affected by a change to a Use Case can provide invaluable information that relates directly to cost, scope and project planning. Figure 1: Typical Project Size Why are people not using Use Case diagrams? Figure 2 shows the reasons given by respondents for not using Use Case diagrams (respondents were allowed to choose more than one answer, so total % is greater than 100). Looking at this data, there are a few areas
