What's with the three shifts? 8-hour working system, please help, I don't know, the more detailed the better!

Three shifts is a working system of three shifts in the morning, middle and evening, 24 hours a day, and each shift is 8 hours. General hospitals, energy, steel, automobile enterprises, private or foreign-funded factories and other units need a general 24-hour manned unit scheduling system.

In the case of "positive shift method", employees are transferred from morning shift to middle shift, from middle shift to night shift, and so on. In the case of "shift method", employees are transferred from morning shift to night shift and from night shift to middle shift, and so on. In the case of positive shift method, workers who work at night shift and early shift should work continuously for 16 hours (i.e. playing continuous shifts); In the case of shift work, workers in the middle shift and the early shift at night can only rest for 8 hours (that is, shift work).

For doctors and security guards, working at night is inevitable.