Building complex object-oriented systems with patterns and XP

Complexity is a characteristic of many important systems. These systems have a large number of interacting entities, complex constraints, and need to satisfy nonfunctional requirements. We use Semantic Analysis Patterns (SAPs), a type of analysis patterns where each pattern corresponds to a basic set of Use Cases, to build a global conceptual model in an incremental way. This global model provides XP with a structure to consider aspects such as distribution, security, and testability. SAPs can also be used at each incremental stage in XP to guarantee the application of good software development principles.