This report discusses how Tesco, a British general merchandise retailer, uses big data to control heating costs, improve value chain, and make confident decisions. The report explains the three parameters of big data, which are volume, velocity, and variety, and how they play an important role in Tesco's data systems. The advantages of implementing big data decision making in Tesco are also discussed, including awareness throughout the business, data as market research, and confident and quick decision making.