Correct Answer: An objective range that indicates if a process is considered stable.
Explanation:Control limits - those which set an objective range to indicate whether a process is controlled or stabilized or defect free (e.g., within three sigmas of the mean) - may be used in an agile project. Generally, a control limit of three-sigma (s) is used on a Shewhart control chart. A sigma refers to one standard deviation. So three sigmas indicates a limit three standard deviations away from the mean in both the positive and negative direction. This applies to normal data, where a normal distribution curve has been obtained. [Lean-Agile Software Development: Achieving Enterprise Agility. Alan Shalloway, Guy Beaver, James R. Trott.] [Knowledge and Skills: Level 3]