The process competence is found to be in a low level in the competence analysis that has been carried out on the critical values during the “analyze” stage. Distributions are generally accumulated below the LSL value or above the USL value. Adequacy indices are also quite remote from the target CPK > 1.
In another study, possible resources of the problem of the door’s rubbing onto the body have been researched. By examining the body manufacturing process, error sources are determined with the technical personnel responsible for quality control and Quality Assurance Engineer. Then, it is classified depending on machine, method, materials and human categories and cause-effect diagram (Fig. 11) has been established.