Selection of Estimation Tehniques

It depends on the stage of your project. If you are in early stages at charter, you likely don't have much details available. At this time, you would likely make a high level estimate based on similar past projects experiences. As you move towards preliminary design, you will base your estimate on each scope item validated by conversations with industry to get a high level estimate. As you near detailed design, you will base your estimate on work packages and WBS with unit rates. At the time of Tender you will refine it further.

I would also say to consult with an expert in the area being estimated. Determine which area will have the most impact on the estimate ..or determine which area holds the highest risk ..rf which area hold the most variability or unknowns. That's the expert you need to consult. Pat

I would also say to consult with an expert in the area being estimated. Determine which area will have the most impact on the estimate ..or determine which area holds the highest risk ..rf which area hold the most variability or unknowns. That's the expert you need to consult. Pat