Step 4: Action
This is the result of the decision. Once the decision is made, then the character has to do something about it. As Laurin said, sometimes the decision is to deal with it later. But there should be some kind of culmination to the thinking and the decision.
I have become a huge fan of the scene sequel. Laurin told me she kept the formula on a sticky note on her computer for years, and now I do the same. The sequel is relatively simple, just four steps, yet it allows us to understand the characters on a deeper level. I think part of the reason the formula works so well is because it mimics our real-life process of dealing with whatever it is we have to deal with. First we react in an emotional way, then we think about it, then we decide what to do, and then we do it (or we decide to do nothing, which, as Laurin pointed out, is also a decision).