There's a world of difference... People have been working on houses for... a couple of thousand years?... there's not much that's unknown about house building.

There's a world of difference... People have been working on houses for... a couple of thousand years?... there's not much that's unknown about house building. Software building? Not so much. It's almost always all unknowns. New libraries, new programming languages, new requirements never before dreamed of, new everything. Your parallel with housebuilding is a false one.