In quality control and manufacturing processes, the allowable deviation is usually set to an acceptable range, which means that it is allowed to produce a certain degree of error or variation and still meet the requirements of the product or service. For example, in the production of an automobile engine, the dimensions and weights of each part may vary slightly, but as long as they are within a specific allowable deviation, they will still make up a reliable engine.
Allowable deviations are often one of the factors considered when developing specifications and standards. For certain industries and applications, such as aerospace and medical devices, allowable deviations can be more stringent and require more precise testing and control.