The correct answers are: The ability to control; The ability to motivate.
This is due to the fact that three elements of the SMART mnemonic are related to control: specific, measureable and timebound. Objectives that meet these criteria will ensure that managers can be held accountable for their actions. The final two, agreed and realistic, aid motivation: objectives that are agreed will be internalised and accepted as appropriate; and realistic objectives are attainable but challenging enough to motivate.
