Figure 1-2 is a composite drawing that shows the relationships between several different parts of the overall project/program process.
Figure 1-2. Project/Program Requirements Control Relationships
The requirements (near the middle) are actually the beginning. The requirements drive the project/program implementation concept (up) and the project/ program documentation and methodologies (down). On the upward leg, the requirements are converted into schedule and budget. On the downward leg, the requirements are decomposed into the Work Breakdown Structure (WBS).
The WBS is arguably the most important tool of the project planning process. ...