This essay analyzes three key strategy development tools: the PESTLE framework, SWOT analysis, and the Profit model. The essay begins by introducing the concept of strategy development and its importance in business. The PESTLE framework is examined as a tool for external environmental scanning, discussing factors like political, economic, socio-cultural, technological, legal, and environmental influences, with examples. The SWOT analysis is presented as a tool for understanding internal strengths and weaknesses and external opportunities and threats, with examples. The Profit model is then discussed as a tool for determining the effectiveness of strategies and initiatives, including its components and applications in value proposition, with examples. The essay concludes by summarizing the significance of these tools in shaping business approaches and strategies. References are provided to support the discussion.