What is Manual keigo?

Manual keigo , is a controversial form of honorifics in the Japanese language. Employers such as fast-food and convenience-store chains publish training manuals for employees, especially young part-timers who have little experience with honorifics. These manuals incorporate nonstandard formulas for servers and cashiers to use when addressing customers, most often by using alternate expressions which are longer and vaguer than the standard expression. Manual keigo are opposed by language purists on the grounds that their use frequently leads to non-grammatical and illogical constructions.

Other terms for the same phenomenon include "part-timer's keigo," "convenience-store keigo," and "family-restaurant keigo."