This document summarizes key concepts from Chapter 2 of Exploring Corporate Strategy, 7th Edition related to analyzing the external environment. It discusses performing PESTEL, scenario planning and Porter's Five Forces analyses to understand macroenvironmental factors and industry competition. Additionally, it covers strategic groups, market segmentation, critical success factors, and identifying opportunities and threats from analyzing the strategic environment. The overall aim is to provide frameworks for evaluating external influences and competitive dynamics facing organizations.