You seem to agree that the testability is not binary: > Soft sciences are those that don't lend themselves to testing and verification very well, like economic

You seem to agree that the testability is not binary: > Soft sciences are those that don't lend themselves to testing and verification very well, like economics and psychology. But want hard to only used in a binary fashion with some heuristic triggering the step function from soft to hard. People do talk using the term that way. They also use it as a continuum saying one field is harder than an another. I quoted the terms, "hard" and "soft" in my message above because the terms are used in a few different ways and are not rigorously defined. They only need a rough definition to make the point I was making though.