Situation Analysis: this section includes all the market research results with various subsections. It includes an external analysis (macroenvironment and microenvironment analyses) and an internal analysis (with the assistance of various internal matrices such as BCG Matrix and General Electric Matrix).
When I ask entrepreneurs and small business owners, it is not unusual for not having any marketing plan. I once read that Sir Richard Branson never had any marketing plan when he started the 1st Virgin business many years ago. In fact in one study of entrepreneurship (I couldn't recall the name of the study) was that as much as 50% of entrepreneurs and business owners don't have a business plan and marketing plan when they first started the business.