Book excerpt: Using the Catalysis approach, Objects, Components, and Frameworks with UMLdetails the recurring patterns within UML. Catalysis is a rapidly emerging UML-based method for component and framework-based development with objects, and it is gaining popularity because it allows developers to more easily build business models, requirement specs, designs, and code. The authors describe a unique UML-based approach to precise specification of component interfaces using a type model. By identifying patterns in this notational language, the authors provide application developers and system architects with well-defined and reusable techniques that help them build open distributed object systems from components and frameworks. Expected Availability: September 1998