We express in Figure 1 Defect Density as being inversely proportional to Quality. A high quality product exhibits a low defect density. Referring to Figure 1 a project manager has the freedom to navigate the project between the triple constraints. When trying to reduce the cost (moving from the left scenario to the right), he is likely to reduce the quality as less money is available for validation and verification activities. This may also reduce the time that can be spent on the project. Similarly a reduction in the time for the project can lead to higher cost through