If you look up plot structure you will find something like this:
Five Basic Elements of Plot Structure
1. Exposition (Beginning)
2. Rising Action - Introduction of the conflict
3. Climax - the high point
4. Falling Action - what it says
5. Denouement - the untangling of the strands of plot
Or you might find any number of ways plot can be structured but they will all include these same points with slightly different names - The Hero's Journey for instance:
Studies of various ways to structure your plot can be helpful and I do look at them and ponder their relevance to my story.
I am thinking, however, in a different way during this revision. It is as if I have decided the sort of house that I am building - the motifs, the rhythm of it - how one might move around in it. It isn't a cozy Agatha Christie cottage in the Dales or a Stoker castle in Austria. No, it is a comfortable family home in North America in a four season climate. It is sturdy but not overly decorative...etc... So that has been chosen. But now, as I build this house, I am considering questions such as 'do I need the stairs to rise from the front of the house or the back. Do I want an open plan or a more closed off traditional style? The house is pretty much built but unlike real houses, I can change things without too much expense incurring. I can decide to start it later or earlier. I can move one bit of action up and slow the pace down by putting a quieter scene in somewhere. I can strengthen the motifs and amp up the conflict. I can see that I've been too kindly to my protagonist and give her more problems to solve. I can revise for clarity and surprise too. I'm not ready to decorate yet but I will be soon - then I can make sure every word is the right one and that I haven't chosen hackneyed phrases or metaphors. It is damn exciting to be at this stage I can tell you!
I think the main thing I need to remember is that, just like when the man and I were designing this house on paper, I can change my mind. Just because I wrote it one way doesn't mean it has to stay that way. I can decide right now and after carefully checking with my characters to make sure it fits for them change a plot point radically. It doesn't mean I will BUT I CAN.
Yesterday I moved several chapters around and I might need to move them again or toss them and it is essential that I don't get caught up in believing something has to stay the way it was first put down.
What have you discovered in your writing process or your revising one that you need to constantly remind yourself of?