The Unified Modeling Language (UML) is a consolidation of the best practices that have been established over the years in the use of modeling languages. UML enables us to present the widely varying aspects of a software system (e.g., requirements, data structures, data flows, and information flows) within a single framework using object-oriented concepts. Before we venture too deeply into UML, however, in this chapter we first explain why modeling is an indispensable part of software development. To do this, we look at what models are and what we need them for. We briefly recapitulate the basic concepts of object orientation before continuing with an overview of the structure of the book.
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