Warfare was the most common and successful way in which the Incas were able to expand their empire.
I believe the answer is: Implements
This mean that the strategist should always ensure that the plant that he/she create not only elaborate, but also executable.
This can be done by designing the plan in several collective steps, which make it easier to divide the job descriptions to execute the plan and clearly convey the responsibilities that held by each executors.
Substance abuse would be the answer. Hope this helps.
They will make him feel happy and great because he got an "A" of his test