The SOSTAC Marketing Planning Model is a marketing planning model that can be used by companies to plan for the future. It is a five-step process that starts with identifying the company vision, followed by defining and understanding the target market, then developing a marketing strategy, creating an action plan, and finally implementing it. The SOSTAC Marketing Planning Model is an effective way of planning for the future because it helps companies to identify their current customers and potential customers. It also helps them to identify how they want to reach their target market in order to develop their marketing strategy.