A Business Case is a written document that you can use to obtain senior management approval and get them on board with your innovative idea. It is a resume for your project 1. To justify the risk of investment 2. Convince Management to endorse your idea (Your idea is the best solution to solve the problem) 3. To ensure you logically think through ? from concept to project and finally delivered as a successful project

A Business Case is a written document that you can use to obtain senior management approval and get them on board with your innovative idea.
It is a resume for your project 
1. To justify the risk of investment
2. Convince Management to endorse your idea (Your idea is the best solution to solve the problem)
3. To ensure you logically think through – from concept to project and finally delivered as a successful project