This isn't really a theory but a set of tools that help you do your job. A theory would gives a means to make predictions about software engineering projects. I

This isn't really a theory but a set of tools that help you do your job. A theory would gives a means to make predictions about software engineering projects. It would naturally give us a way of working such that projects don't fail. But I don't disagree with you. It's important to learn those things.