The timing of making self-maintenance opl should be the training before the class meeting, as shown below.

OPL is the abbreviation of "a little lesson", also known as "a little lesson" and "a drop of education". OPL is an educational method for training in the process of work, and it is also a tool for communication and training.

OPL usually carries out training before shift change, and the time generally does not exceed 10 minutes, also known as "10 minutes education". Its content is mainly about the improvement of production line, including improvement, problem solving, operation and maintenance skills, knowledge and safety.