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Aspect-Oriented Software Development with Use Cases by Pan-Wei Ng, Ivar Jacobson

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Chapter 1. Problem to Attack

Component-based development is a widely used approach to build complex systems. Basically, you allocate requirements to components of some kind—classes, packages, services, and so forth. Although many requirements can be effectively localized to individual components, you find many requirements that cannot be localized to an individual component and that sometimes even impact many components. In aspect-speak, these requirements cut across components and are called crosscutting concerns. The inability to keep such concerns separate during design and implementation makes a system difficult to understand and maintain. It inhibits parallel development and makes a system difficult to extend and results in many of the problems ...

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