Reviewing a number of (engineering) design textbooks, it strikes me that none of them discuss what a good set of concepts looks like, other than that they are the most promising options.
Together with the fact that these textbooks give little to no guidance on how to construct and present the complete case arguing the final design, this lack of discussion on the collection of concepts as a collection – and what defines it as such – seems to be a result of these books’ framing of design and the design process in a professional context.
One big difference between that professional context and an academic context (including many educational settings) is the role and presence – or lack thereof – of a client. Concept selection seems like a particularly good example of this. In a professional setting, you would present your concepts and your evaluation of them, together with a recommendation on which to proceed with, to your client(s). You would give them the final say or ‘OK’ on that decision, or at least come to a consensus. And because that decision is taken together, at a specific moment in time, in a specific project context, it matters less whether that set of concepts has a particular logic to it.
In an academic context, however, if you present concepts and a comparison at all, you present them only at the end of the project, together with the – further developed – final design. You write it all up in a single (peer-reviewed) paper. In that context, where you’ve selected a concept yourself and already further developed a design based on one, the concept comparison and ‘selection’ is no longer a forward-looking strategic proposal but a component in the justification/support for your final design. Rhetorically and epistemologically, it’s doing (can do) something quite different.