This document describes the use of check sheets as a quality control tool. It begins with an introduction to quality control and defines key terms. It then explains what check sheets are, when they should be used, and their advantages and disadvantages. Several types of check sheets are described, including process distribution, defect type, defect location, and defect cause check sheets. An example is provided to illustrate how check sheets can be used to standardize data collection, track metrics over time, identify root causes, and facilitate continuous improvement. Check sheets are presented as an effective way to engage employees and improve overall quality control processes.