IBM's VisualAge for Smalltalk is a complete system for developing powerful client applications. This book shows developers how to succeed with versions 3.0 and 4.0 of VisualAge. It covers helpful background information on the Smalltalk language, the common graphics subsystem, the common widget subsystems, and visual programming in VisualAge. It serves both as an introduction to the Smalltalk language and to the base classes of IBM Smalltalk. Programmers with and without previous Smalltalk programming experience will find it useful. Code examples illustrate VisualAge, Smalltalk, and the use of graphics widgets and reusable parts on VisualAge. The book includes a floppy disk which contains Smalltalk expressions and statements, source code segments from examples, Smalltalk classes, and descriptions of examples of visual and non-visual parts.