Tests. It's important to test out our ideas before going into production, because if we've had practice it will make for a smoother flow of difficult scenes. Casting During casting, we tested the actors on their ability to improvise. Although this isn't a test in terms of production, it helped us a lot to know who is going to have enough confidence to improvise without too much prompt to do so. If we prompt them to improvise, it will seem forced, but if we brief them on moments that could include improvisation, they might add something that we hadn't thought of. In the past, moments of improvisation have drastically improved scenes with just the smallest action, such as Mac swigging from the vodka bottle in DEADline . During the casting, we first asked them to read part of scene 15, where Rob tries to convince Martin to continue with his AA meetings. We chose this because it's a particularly personal scene which really shows the pair's relationship....