This essay provides a comprehensive analysis of competitive strategies, focusing on the application of PESTEL, Input/Output, and Porter's Five Forces models within the context of the Woolworths supermarket retail company. The introduction defines competitive strategy and its importance in achieving a competitive advantage and increasing ROI. The essay then delves into the PESTEL model, evaluating the external environment and highlighting the impact of political, economic, social, technological, environmental, and legal factors on Woolworths. The Input and Output model is discussed as a strategy development tool, illustrating its use in evaluating inputs, outputs, and required processes. Finally, the Porter's Five Forces model is examined, demonstrating how Woolworths uses this tool to assess competitive rivalry, the threat of new entrants and substitutes, and the bargaining power of customers and suppliers. The conclusion summarizes the key findings and emphasizes the importance of these tools in achieving sustainable business success and remaining competitive in the marketplace.