The chapter discusses the importance of a well-written business plan. It covers key topics such as the concept of a business plan, why it is needed, how to write an effective plan, and considerations from the perspective of financiers. An important point made is that a good plan contains all the necessary information for financiers to decide on funding without needing to speak to the entrepreneur. The chapter also examines feasibility studies, financial plans, and the role of consultants in preparing strong plans and studies.