Marks & Spencer is a British multinational retailer that started in 1884. After experiencing serious sales declines in the 1990s due to outdated strategies and leadership issues, Marks & Spencer launched initiatives like Plan A to improve its social and environmental impact, and Project 2020 to update its supply chain and IT systems. The human resources department supports these changes by promoting diversity and training. Marks & Spencer also uses strategies like decentralization and focusing on food offerings to address weaknesses identified in a SWOT analysis.