Kerridge is a (virtual) Automotive industry standard programme.

Essentially, it allows Job Cards to be raised. Invoicing, Oridering of parts and buying of parts. Check vehicle history etc etc

Its fairly complex, I used to have a basic working knowledge of it. But Ive forgotten. I nearly went on the training course for it. ITs worth having if you plan to go in that direction in your career. Mercedes, Vauxhall, Saab, Jaguar are a few of the people that use it.

VAG have a different system which is much easier to use.