There are many software programs developed by many software developers in these days. The people who are going to interact with them need some time to learn about how to do their tasks using those software programs. Some of these software programs need more than expected time to learn about using them because of poor design of the User Interfaces. User Interfaces are the main windows which are used by the people to interact with the software program because of that they must be designed in better way which attracts the attention of the user. Therefore in Human Computer Interaction principles, there are principles for designing of User Interfaces which make them effective & attract attention of the users. It is essential to evaluate the performance of software programs before releasing them to users. Although this can be done by manually but software developers cannot rely on the results of these methods because users may not provide correct information. This book proposes a system which can evaluate performance of the software programs by considering the interactions with the users with the programs.