Check Sheets

Check sheets are one of the seven basic quality tools and serve as data collection forms used during Control Quality. They provide a systematic way to gather quality data such as defect counts, defect types, locations of defects, or frequency of events. The data collected on check sheets typically feeds into other quality tools like histograms, Pareto charts, and control charts for further analysis.\n\nThe design of a check sheet should make data collection simple and error-free. Common types include defect location diagrams (marking where defects appear on a drawing of the product), tally sheets (counting occurrences of different defect types), and frequency check sheets (recording how often events occur within time intervals). The key is that the form is pre-structured so the data collector only needs to make marks rather than write descriptions.\n\nCheck sheets are distinct from checklists, although the terms are sometimes confused. A checklist verifies that required steps have been performed (yes/no). A check sheet collects quantitative data about what is happening during a process. Both are valuable quality tools, but they serve different purposes.