The SOSTAC Planning Model is a model that helps companies plan the future of their products and services. It is a planning model that uses the phases of the S-curve to help companies design their products and services. Companies can use this model to identify what they should do in each phase of the S-curve. For example, if a company is in Phase 1, they would focus on building awareness for their product or service. If they are in Phase 2, then they can focus on increasing sales and reaching new customers.