Ability to Influence the Final Cost
Figure 6 shows the extent to which the ability
to influence the final cost of the project diminishes as the project moves forward.
Obviously, the owner's requirements, and to a somewhat lesser degree regulatory
requirements, have primary impact on the project's final cost.
Some degree of iteration is inevitable and normal during the Concept and Development
(Planning) phases of a construction project in order to test ideas and see what
works best. However, assuming an otherwise orderly progression without significant
back-tracking, the ability to influence the final cost drops rapidly during these
phases. As the specifications and working drawings are developed during the first
stage of the Execution phase, the opportunities are even further diminished.