As a R&D staff, I try to learn some more about business, market, management to know how the company runs everyday. It is certain to be benefitful to develop a new or innovative product from market need to prototype development, to manufactoring and quality managment, to sales. Finaly, I think how to write a business plan is a good way.
I have invested in stock many year, known the basic economy knowledge and read many annual reports of listed companies. However, annual reports are mostly what have done in the company. Business plan is about what the company will do. Its main aim is similar to the funding proposal wrote in the university, i.e. raising money.