Definition. Critical appraisal involving examination, measurement, testing, gauging, and comparison of materials or items. An inspection determines if the material or item is in proper quantity and condition, and if it conforms to the applicable or specified requirements.Inspection is generally divided into three categories: (1) Receiving inspection, (2) In-process inspection, and (3) Final inspection.n quality control (which is guided by the principle that Quality cannot be inspected into a product) the role of inspection is to verify and validate the variance data; it does not involve separating the good from the bad.