A software tool is provided to analyze static source code. Source Code files are selected to define the project work space. A class and a method in the class are selected from said selected source code files. The tool generates a Call Tree as an ordered recursive sequence of all method calls in different classes or their instances that are invoked by said selected method in said selected class. A Sequence Diagram is generated from said Call Tree. The tool remembers all updates to the Call Tree used to generate the Sequence Diagram. This information is used when a generated Sequence Diagram is impacted due to changes made to any source code file included in the project.