Six Sigma Overview
Six Sigma is an organization wide approach to statistically improving processes with the aim of reducing variation. By reducing variation, processes are more consistent, reliable, and predictable. Mathematically speaking, every process in the world can be defined by the following function:
Or in plain English, Y is a function of multiple Xs. The Xs are the actions and conditions that are coming together at any given time to form an outcome – the Y.
Six Sigma projects use a five step approach referred to as “DMAIC” (duh-may-ik):
Define: Form a clear, concise, statement of the project Y
Measure: Obtain baseline data that quantifies the current performance of the project Y
Analyze: Examine the process to identify the key Xs that influence the project Y and prove the relationship between the Xs and Y
Improve: Identify, select, and implement solutions that improve the Xs (and thus improve the Y)
Control: Establish control mechanisms that solidify the improvements and prevent the process from “back-sliding” over time.
Define: Form a clear, concise, statement of the project Y
Measure: Obtain baseline data that quantifies the current performance of the project Y
Analyze: Examine the process to identify the key Xs that influence the project Y and prove the relationship between the Xs and Y
Improve: Identify, select, and implement solutions that improve the Xs (and thus improve the Y)
Control: Establish control mechanisms that solidify the improvements and prevent the process from “back-sliding” over time.
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