This is a book about component-based software engineering (CBSE). CBSEis the emerging discipline of the development of software components and thedevelopment of systems incorporating such components. Component-basedsystems are built by assembling components developed independently of thesystems. To assemble components, a proprietary code that connects the componentsis usually needed. This code is often referred to as “glue code.” In anideal world of components the assem bly process would be smooth and simple.The effort required to obtain the glue code would be practically negligible; asystem incorporating components would know everything about them—theiroperational interfaces and their nonfunctional properties and the componentswould be exactly what the system needs; in short, components could beassembled as easily as Lego blocks. bly process would be smooth and simple.The effort required to obtain the glue code would be practically negligible; asystem incorporating components would know everything about them—theiroperational interfaces and their nonfunctional properties and the componentswould be exactly what the system needs; in short, components could beassembled as easily as Lego blocks.