This report provides an in-depth analysis of the role of Information Technology (IT) within the retail giant Marks & Spencer. It explores how IT contributes to the company's successes and failures, examining areas such as decision-making, marketing, communication, and sales. The report delves into ethical and social issues pertinent to running a business, including security, software piracy, and identity theft, and discusses the importance of networking technologies, including PAN, LAN, WAN, WLAN, and SAN, in supporting business operations. Furthermore, it highlights the significance of the internet and intranet for Marks & Spencer, particularly in terms of virtual teams, marketing, knowledge management, and corporate communication. Finally, the report outlines the different stages of the system development cycle, such as planning, analysis, design, development, implementation, and maintenance, emphasizing their importance in creating new electronic payment systems and improving business processes.