Sop is the capitalization of the first letter in the three words of standard operating procedure, which means standard operating procedure, that is, describing the standard operating steps and requirements of an event in a unified format to guide and standardize daily work. Sop is an internal program designed by a complicated daily office with limited time and resources. From the management point of view, standard operating procedures can shorten the unskilled and complicated learning time of recruits, and mistakes and negligence can be avoided as long as they follow the instructions of the steps. The essence of Sop is to quantify the details. In more popular terms, Sop is the key control point in the refinement and quantification program.