This document provides an overview of several frameworks for analyzing a business's external environment and competitive landscape. It describes Porter's Five Forces framework, which examines the competitive balance of power in an industry. It also outlines PEST analysis, the industry lifecycle model, and analyses of key success factors and environmental forces. Additional models covered include Pearce & Robinson's three environments and Robins' prime forces. The document gives examples of how to apply these frameworks to industries like automotive and gaming.