Object-oriented design has now become a predominant technology and there is urgent need for tools to assist developers in creating those designs. One area that needs support is object-oriented analysis and design, including the drawing of new diagrams and reengineering of existing ones. In this thesis, we describe a tool that can be used to support the drawing of several types of UML (Unified Modeling Language) diagrams for software design and their integration into a larger software development environment and reengineering of existing code. This tool is part of a large project called the Binder developed by students and faculty at Acadia University. It provides special '' page styles'' and an editor for such pages for the Binder. The UML diagrams implemented by page styles and supported by this tool (called UML Drawing Tool or UDT) are: Class and Object Diagrams, Use Case Diagram, Sequence Diagram, State Transition Diagram and Package Diagram. UDT allows creation, editing, display and storage of UML diagrams and partially automatic conversion of class diagrams into Smalltalk source code. These diagrams can then be included in the Binder. This thesis begins with an introduction to object-oriented methodologies followed by a short description of the UML notation and a description of the Binder program. The following chapters include the description, the design and implementation of the drawing tool. The final chapter summarizes the thesis and includes suggestions for future work.