1. Definition Distinction:

A preliminary feasibility study, also known as a pre-feasibility study, is a further technical and economic justification conducted on the project proposal based on the investment opportunity study, serving as an initial judgment on the project's viability. Feasibility studies, on the other hand, are scientific analyses and justifications conducted on the technical and economic viability of the project after the project proposal has been approved.

2. Varying Levels of Detail:

The preliminary feasibility study report has a relatively shallow depth of content in the gathered information, while the feasibility study report has a deeper depth of content in the gathered information.

3. Decision Divergence:

The preliminary feasibility study report provides decision-making consultation on whether to initiate the construction project, while the feasibility study report offers consulting services for the investment decision regarding the construction project.