Writing, blah, blah, blah. Screenplay, blah, blah, blah.
I've done a step-outline (scene list), and that showed me major gaps in my story. However, I couldn't see where they were. Therefore, I decided to use powerpoint (generic: presentation software) to help me see what needed to be filled in.
I like small scenes, so for my particular story, each slide equals one-2 minute scene. I will need 50-55 scenes to make a 105 page script...that will probably be more like 45-50 in the end, however.
If I can't fit the scene on the card, then I know that the scene needs to be reworked. Then I play the presentation, looking for the flow and pacing. I notice which characters are being left out for too long and which storylines are forgotten. I also get a feel for when I begin a plot point too late or too early.
Something needs to go in a different place? Just drag it there. Need to delete a scene. A couple of clicks (I only do this on the copy) and it's done.
Very helpful. Best of all, I don't have a hundred cards to mix up or lose.