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).
To make an effective plan, there is a famous rule called 4P's. Here, P's stand for Price, Product, Promotion and Placement. In this another P is added called People. Today while doing digital marketing or the traditional marketing one should understand people or the customers you are dealing with. It's important to figure out what is significant for the business, and later make a plan accordingly.