There is so much a simple street photography image can tell you.
|Source: unknown; credits due|
- the trainee, usually the youngest guy, starts by cleaning the tools and equipment. Probably allowed to install and uninstall the minor parts too.
- the regular mechanic who knows how to do stuff when told what to do. Most of the work is done by such people.
- the expert, I think the guy squatting and smoking, provides diagnostic and knowledge expertise but do little of the actual work himself, unless required.
- the owner or customer keeping an eye on the work(ers).
Bonus: Writing on the wall. "yahan poster lagana mana hai" (it's forbidden to put up posters here). Rarely followed.
These are like corporate policies, may or may not be directly related to employee daily tasks.