At what point into the project lifecycle must the business case be prepared?

The short respond to this is ‘before any exact work has been completed and before main resources are committed to the project’. Several projects are preceded through a feasibility study, the intension of this is to notice whether there is a prima facie case for undertaking the project and a business case is frequently a main output by such a study.

Additionally, this study frequently started with some type of needs analysis and specification. Where that is the case, the detailed information determined here may require a reappraisal of the business case, to ensure about the costs and benefits known in the feasibility study are yet realistic.

Actually, the business case must be revisited at every stage of a project, to ensure that the project is yet on target to get the business advantages for that the project has been started.