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A technique to establish the current performance level of a process metric(s) Used for:
- Understanding current and historical levels of the process (at the start of the project)
- Identifying whether we are meeting customer requirements
- Quantifying the extent of the problem (problem statement at the start of the project)
- Assessing the extent of improvement (Goal statement at the start of the project)
- Quantifying the improvement benefits (towards the end of the project)
- Clearing perceptions of the stakeholders (start of the project) - In order to baseline, we must identify and understand the type of data
Baselining
Baselining: Continuous Data Process Capability
- Voice of the customer is defined by specification limits
- Voice of the process is calculated for control limits or ± 3
- Most process metrics have a desired target value and acceptable limits of variation around the target
- The extent to which measured values fall within these limits determines how capable a process is of meeting its requirements
- Specification limits are provided by customers
- USL: Upper Specification Limit
- LSL: Lower Specification Limit
Process Capability
- Process Capability (Cp) is a statistical measurement of a process’s ability to produce parts to the tolerance range.
- Cp measures a process's potential capability, which is defined as the allowable spread over the actual spread.
- Reducing variation in the process is the most desirable way of improving Process Capability
Process Capability Visualization
Process Capability Index
- Process Capability (Cpk) is a statistical measurement of a process’s ability to meet the target (center), or in other words, it describes how well the process mean is close to the specification target.
- Cpk is minimumof the Cpl or Cpu
Process Capability Index Visualization
