The writing up of a plan with an explanation of why his idea is beneficial to the company is known as a business proposal.
A business proposal simply means a document that's used by businesses to persuade someone about a product.
In this case, the board want him to write up a plan with an explanation of why his idea is beneficial to the company, a budget, and how he will use employees' time.
This is known as a business proposal.
Learn more about business proposal on:
https://brainly.com/question/25311149