Talking about Scheduling: Alpha, Beta and Gama. So Alpha is the one that is in charge of the machine environment which is:
Alpha:
Single machine
Identical machine in parallel
Machine in parallel with different speeds
Unrelated Machine parallel
THE QUESTION IS: Why Alpha is not in charge of Machine in Series? Why just Single machine, Identical machine in parallel, Machine in parallel with different speeds, Unrelated Machine parallel and why not in series?