Casting for Claire

I am closing to finishing Reconciliation, which will be a great relief. It is hard to focus on the new project when you are preoccupied with the practical problems of sound design and grading.
Still, this past weekend I sent out a casting call for the character, Claire, in Tidal Barrier. A week from today I will begin to meet some new actresses.
There are so many reasons I find casting difficult. First, there are so many conventions that I find pointless. Most actors expect to have to prepare and present something. The last thing I am interested in seeing is a Shakespeare monologue. What's that got to do with my script? I suppose the real test is how they react when I throw out the rule book.
The other big question is how they react to a lack of a script. I work from an outline. What do I need a script for? It is a document for producers, so they can't calculate running time and create budgets. There is no budget. And we will be shooting the whole story on DV and editing it. I will have the clearest possible idea of running time and production problems from this exercise.
And there is no dialogue either, the other reason you create a script. So no script, another real test.
And then what do you have them do? In the past I spent a lot of time talking. Finding out about the person and trying to gauge where this person is a capable of going. At the same time you are seeing them react and be, and you capture this on camera.
But recently I have been less inclined to speak, and more inclined to do, and capture the scene on video. Here I interested how they can be on camera, where they can start from, and where they can go, eg. take direction. I am really looking to see how effectively I can get them to not act.