We all work on mental models of the things we use, envision or encounter. I've often found that it was not until I tried to build that model for real that I h

We all work on mental models of the things we use, envision or encounter. I've often found that it was not until I tried to build that model for real that I had missed significant crucial parts, not just a matter of 'incompleteness' or a too high level abstraction, but that my model no matter how elegant was just wrong or unworkable.