During execution, most of the work to deliver the objectives (build the new asset) is done, and thus most of the expenditure made. The stage starts with completion of detailed design. At the previous stage sufficient design (systems design) has been done to prove the concept and obtain financing. From the detail design a cost estimate corresponding to the fourth line of Table 8.4 ("Control") is developed. This design may require three or four times as much effort as the systems design developed at the previous stage, but it is only done after the project has been proven and finance raised. Work can now begin. Resources are selected, and they plan the detail work on a rolling-wave basis. Work is authorized ...

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