Six Sigma

A continuous improvement approach to the quality and efficiency of processes, developed by Motorola, which registered the trade mark. Measuring process performance is at the heart of the approach, which has five main steps, each drawing on different tools. The first looks for the causes of the malfunctions that affect the quality and efficiency of processes. The second is a measurement step that feeds the modelling of processes and the search for causes. Depending on the results, steps four and five improve and control the effectiveness of the actions taken.