Specification limits are set by the customers; often, Voice of the Customer is referred to as the customer specification limits.
A run chart is a basic graph displays data as they evolve over time. Simple rules can be useful for identifying trends or shifts in process.
A response plan sets out what to do if a process doesn’t meet one of the quality assurance requirements in the control plan.
The Plan Do Check Act Cycle, aka A Deming wheel, Shewhart wheel or Shewhart Cycle is the foundation of continuous improvement frameworks