This one-day tutorial is aimed at software engineering practitionersand researchers, who are familiar with objectorientedanalysis, design and programming and want toobtain an overview of the technologies that are enablingcomponent-based development. We introduce the idea ofcomponent-based development by dening the concept andproviding its economic rationale. We describe how objectorientedprogramming evolved into local component models,such as Java Beans and distributed object technologies,such as the Common Object Request Broker Architecture(CORBA), Java Remote Method Invocation (RMI)and the Component Object Model (COM). We then addresshow these technologies matured into distributed componentmodels, in partiuclar Enterprise Java Beans (EJB) and theCORBA Component Model (CCM). We give an assessmentof the maturity of each of these technologies and sketch howthey are used to build distributed architectures.