Since your executive summary leads your business plan, it is important that you carefully construct this first section. In fact, the executive summary is so important that it is placed directly after the title page, even before the table of contents. Many find that writing this key section works best when completed last. The executive summary serves as a synopsis of all the sections of the business plan. If you wait until the end, you will be better able to write a cohesive and complete executive summary.
Remember that each section in your business plan will overlap. This means that you may cover information more than once as you move from section to section. This is okay. Your business plan may be considered as a whole or may be viewed as individual sections. This means that each section must include all key information. Don't neglect including important information simply because you feel it has been covered in other sections.