Softimage does not currently offer an Integrated Development Environment (IDE) for VBScript or JScript. However, you can write your code in the Softimage Script Editor and use the Microsoft Script Debugger to debug it interactively.
Python uses its own debugger which can be called by setting a breakpoint in the editing pane (ToolsSet Breakpoint from the contextual menu). This is an extremely useful tool when experimenting with Softimage because it allows you to debug your code in an interactive shell that also interacts directly with Softimage.