Premise: These tools are (1) a quality concept that uses statistical process control to bring critical manufacturing processes under control so they are repeatable, sustainable, and consistently producing parts within the quality tolerances and standards of the product and (2) product tests in operational conditions that ensure the system would meet reliability goals-the ability to work without failure or need of maintenance for predictable intervals.

Hypothesis: The tools are used to improve production quality through a variety of methods.
Relation: entailment