startup business plan serves several purposes. It can help convince investors or lenders to finance your business. It can persuade partners or key employees to join your company. Most importantly, it serves as a roadmap guiding the launch and growth of your new. business.Writing a business plan is an opportunity to carefully think through every step of starting your company so you can prepare for success. This is your chance to discover any weaknesses in your business idea, identify opportunities you may not have considered, and plan how you will deal with challenges that are likely to arise. Be honest with yourself as you work through your business plan.A good business plan is clear and concise. A person outside of your industry should be able to understand it$.$ You will be completing a business plan executive summary.