1. Decision making involves recognising the need for a decision, identifying alternative solutions, evaluating the solution and 2. When a business evaluates each decision alternative the key question is 3. Costs or revenues that do not differ between alternatives can be because they will not help in choosing between alternatives. are cost increases resulting from the performance of an additional activity. are the costs that must be incurred to perform an activity, but that can be avoided if that activity is reduced or discontinued. ignored avoidable costs what difference does it make making the decision incremental costs