Relevant cash flows: Cost and revenues which are future and incremental, it does not include sunk and already committed cost. Are you agree?

Yes.

These are cash flows that will be incurred or avoided as a result of either taking up an investment opportunity or not.

Relevant cash flows must be cash flows that occur in the future and are incremental.

Cash flow

While on the face of it obvious, only costs or revenues that give rise to a cash flow should be included. Accordingly, for example, depreciation charges should be excluded.

Future

Any relevant cash flow should arise in the future. Anything that has occurred in the past is referred to as a sunk cost and should be excluded from relevant cash flows.

Incremental

Only cash flows that arise because of the decision being made should be included; any cash flow that would have arisen anyway, sometimes referred to as a committed cost, should be excluded.

Opportunity cost

While not specifically included in the definition of a relevant cash flow (as noted above) opportunity costs are also relevant cash flows. Opportunity costs are the revenues that are lost (or additional costs that arise) from moving existing resources from their current use and are therefore considered to be incremental cash flows arising in the future to be taken into account.

Agreed

relevant cash cost and revenue are the cash flows regards future decession making 

on the other hand sunk cost is the cost the already had been accured so it is not relevant to future decession making

for committed cost it is cost related to past decessions so it is not relevant for future decession making