There are two types of work – running things and changing things. By “running things”, I mean playing a defined role within a system. “Changing things” means helping to refine or remodel that system.
There are two types of change – optimisation and overhaul. By “optimisation”, I mean making an existing system more effective in achieving its existing goals. “Overhaul” means changing the goals of a system, and redesigning it to meet these new goals.