This report provides a comprehensive analysis of business decision-making processes, focusing on the performance of Sainsbury's. It begins with an introduction to the importance of data-driven decision-making in business, followed by a detailed plan for collecting primary and secondary data. The report outlines survey methodologies, sampling frames, and a sample questionnaire designed to gather customer feedback. The analysis includes a comparison of Sainsbury's and Tesco's sales and operating profits over a period of time, using various statistical tools such as mean, median, range, and standard deviation to interpret the financial performance of both companies. The report also incorporates graphical representations of data, including trend lines for forecasting, and concludes with a business presentation and a formal business report for Sainsbury's management. Furthermore, the report explores the use of information processing tools, activity networks, critical path analysis, and financial tools like NPV to aid in decision-making processes. The final sections include a conclusion, references, and an index of tables and illustrations to support the analysis.