1. Why, when and how to use the right economic evaluation method for a project

Throughout the project, the project manager must be able to give a satisfactory answer to the most legitimate question asked by the company manager, the customer, or both: "How much does it cost? and "How much does it pay?

A project is generally divided into 5 phases:

• analysis ;

• conceptualization ;

• development ;

• validation ;

• communication.

Each milestone is followed by a project review.

However, by definition, at the start of the project at date T-5, the level of information is very low. It gradually increases to reach (theoretically) a level of 100% at date T0 (see Figure 1).