What's the difference (or correct way of saying it) between the followings:
"Review plan" vs "Review a plan" vs "Review the plan"?
"Agree on plan" vs "Agree on a plan" vs "Agree on the plan"
"Implementation of the plans" vs "Implementation of plans? vs "Implementation of plan"?
I suppose it boils down to when do you add "the" or "a" or not add it at all?