This paper describes two (2) different techniques for the formulation of project and system level requirements, document management and Model Based Systems Engineering (MBSE). In those projects that concentrate on document management the emphasis is on the production of system specifications. A more comprehensive approach, using MBSE, emphasizes the process for defining and solving the systems engineering problem. As part of those efforts, MBSE incorporates the capturing of that information in a systems engineering tool. The tool then generates the system specification and other related documentation. The focus is on the engineering rather than the documentation.
The paper describes the differences in the techniques and how they effectuate initial problem scoping, requirements capturing, and boundary definition. It addresses how these initial efforts go on to support system behavior analysis, system design activities, and system testing. Also addressed is how the various techniques support requirements traceability, verification and validation, configuration management, and project change control.