This may be semantics, but I think of software engineering as the slightly larger scope of building real-world solutions with software and hardware. Civil engineering is not (just) about mixing the right cement and letting it cure at the right temperature for the right length of time, nor is it strictly about building a bridge, it's about building a bridge for the right price in the right amount of time that will last a given number of years, all parameters which were determined through a careful process and making decisions with stakeholders, while applying scientific principles (geology, materials science, etc.) and good people management skills. Oh, and the successful bridge project leaves behind the documentation of the bridge as built and a structure to assure its proper maintenance.

However, I do agree that handling the huge and complex range of inputs, not only the expected ones, is a great beginning to the process, one that is often overlooked. And same goes for internal monitoring, to make sure your system is still functioning as designed.