This report provides a comprehensive competitive strategy analysis of Woolworths and Coles, the two dominant players in the Australian retail industry. The analysis examines the impact of Aldi's entry into the market and identifies key strategic issues faced by these companies. The report applies Porter's Five Forces framework to assess the competitive dynamics within the retail sector, evaluating factors such as buyer power, supplier power, threats of new entry, rivalry among firms, and threats of substitutes. Furthermore, it explores the business strategies of both Woolworths and Coles, including their approaches to fresh products, customer focus, innovation, and lean retail models. The conclusion highlights the similarities in their strategies and their effectiveness in navigating the competitive landscape. The report is based on the case study brief provided and references academic sources.