Top-Down and Bottom-Up Approaches to Architecture-Level Development

Top-Down Decomposition: Pathway from Requirements to System Architectures We promote "Systems Engineering Development Procedures" that employ formal design/requirements representations connected by mappings and traceability. A simplified view of systems-level development is as follows: Figure 1. Traceability Mappings for the Development Pathway, Goals/Scenarios through System Evaluation. Points to note: Traceability begins with the connnection of goals and scenarios with use cases. It links the requirements and specifications with models of system behavior, system structure, and procedures for system evaluation.

Section 1-1: June, 2003.