I believe we might be thinking about different project sizes here. I'm not speaking about building a single-family home. The complexities of construction proje

I believe we might be thinking about different project sizes here. I'm not speaking about building a single-family home. The complexities of construction projects arise at a much larger project volume compared to software projects. The equivalence to a single-family home (which agreeably bears considerable material costs, and already requires a couple of people to build) might be a simple RoR application. Very straightforward, and to some extend every professional agrees on how to execute on that. But if you accept a certain multiplicator in project costs (say, two orders of magnitude) before you compare a construction project to a software project, you will notice a lot of challenges commonly attributed to software projects.