This report describes the system design and implementation for the Teaching Assistant Assignment Planner System (TAAP) for Computer Science Department in Concordia University. TAAP system is expected to provide a convenient way for TA administrator to manage TA assignment task. This report also presents an Object-Oriented approach for the implementation of Graphical User Interface (GUI) for TAAP system in Windows environment. UML (Unified Modeling Language) has been used in the design and analysis procedure of TAAP, and we use Borland Jbuilder 5.0 for the implementation of the user interface. Microsoft Access 2000 has been used to implement the database of the system.