SOSTAC Marketing Planning Model is a marketing planning model that helps companies to define their marketing strategy. It uses four steps - strategic planning, operational planning, tactical planning, and implementation. The SOSTAC model has been widely used by many companies in the US for their marketing strategy. Some of the most notable organizations that use this model are Amazon, Microsoft, Coca-Cola and Procter & Gamble. SOSTAC Marketing Planning Model is a marketing planning model that helps companies to define their marketing strategy. It uses four steps - strategic planning, operational planning, tactical planning, and implementation.