TOPIC: Questions that ask what a PM should do next

I had a few questions in the simulator that asked for what the next step should be. One of the answer sets had both 6.1 and 6.2... It was confusing because Define Activities is a part of Plan Schedule Management. For these types of questions, how does a person know if the "general" plan item (5.1, 6.1, 7.1, etc) is the correct choice over the .2 items?