The purpose of this thesis is to design a Personal Information Manager (PIM) system which can assist people to organize their daily work more easily and simply. The system allows users to store information such as appointments, contacts, notes, tasks and so on. The system also has a holiday list, which allows users to add to or modify it. The system can provide reminders to the users prior to holidays or special occasions and enable them make preparation. Besides the system's obvious functionality, this project is designed to show the appropriate way to develop a graphics user interface. A properly designed user interface can standardize the input and output mechanisms, therefore allowing users to easily manage the entire system. The program was developed by using Visual Basic 6.0, which is simple to use and provides many tools and ActiveX controls to develop an effective application. It also has powerful performance and friendly user interface.