Indeed, sigma (σ) is the 18th letter in the Greek alphabet. Six Sigma is a statistical measure. It’s also a five-step approach to problem solving. The term is often used to designate an organizational initiative to improve a company’s business processes, as in, “We’re a Six Sigma company now.” In some circles, Six Sigma has become a catchall term for management and problem-solving approaches that employ certain tools to improve business processes and results.
At its best, Six Sigma improves the way managers manage by establishing the context in which, and the means by which, they can decide what is important and what isn’t, what requires attention and resources and what doesn’t. Six Sigma is the systematic alternative to managing by the seat of the pants, by the way it’s always been done, or by assumption, opinion, table pounding, or wishful thinking. In marketing and sales, it is also the alternative to the numbers game. Process improvement doesn’t do away with management principles such as responsibility, authority, chain of command, and span of control. Nor does it ignore management practices such as goal setting, planning, delegating, and controlling to plan. Instead, it enables managers at all levels to adhere to those principles and employ those practices. It does this by keeping them focused on the customer, on the