Michael's team is presenting a robot before their examiners. What do they need which is a definitive description of the final product or a system?

Michael's team require an scheme called blueprint in the presentation because blueprints are a definitive description of the final product or system.

Explanation:

The reason behind this answer is that this is a presentation to present a project to a certain public. The public has to be convinced to carry on the project. However, Michael's team can only provide a scheme or in this case a "blueprint" which is a very detailed description of the final product or system. They could also use model but models are not descriptions.