22.1.3.1 Architecture Patterns and Design Patterns. An Architecture Pattern expresses a fundamental structural organization or schema for software systems. It provides a set of predefined subsystems, specifies their responsibilities, and includes rules and guidelines for organizing the relationships between them. - architecture patterns in this context still refers solely to software architecture. - In the TOGAF standard, patterns are considered to be a way of putting building blocks into context; for example, to describe a re-usable solution to a problem. Building blocks are what you use; patterns can tell you how you use them, when, why, and what trade-offs you have to make in doing that. Patterns offer the promise of helping the architect to identify combinations of Architecture and/or Solution Building Blocks (ABBs/SBBs) that have been proven to deliver effective solutions in the past, and may provide the basis for effective solutions in the future. A *Building block* is a package of functionality defined to meet the business needs across an organization

Patterns offer the promise of helping the architect to identify combinations of Architecture and/or Solution Building Blocks (ABBs/SBBs) that have been proven to deliver effective solutions in the past, and may provide the basis for effective solutions in the future.