Remember this is one decision made by one president. It should be a narrowly defined decision. That is a book, not a term paper. Johnson's decision making during the Gulf of Tonkin Crisis or Johnson's decision making to escalate the war from February 1965 to July 1965 or Johnson's decision to de-escalate the war in the winter of 1968. Presidential decision making is a key focus of this course.
Many scholars hypothesize that presidents attempt to bring order to decision making.
Without some order, the decision making process can be chaotic. In the first week of class we will discuss foreign policy decision making and the PMM model in detail though we will not go into the three different styles with any depth. That is part of your job as you research and write your paper. Look at the three management styles of the PMM, and examine the decision you have chosen. So, what you are really doing is examining a decision, deciding which management style describes the decision process, then using your research on the decision making process to prove your point.