Before an instrument can score a concept, someone has to decide what the concept is — which attributes belong to it, which are periphery, and what would count as an instance. Most measurement pipelines inherit this step silently. I treat it as work.
What Do Experts Mean by Polycrisis? studies the step empirically: an expert community surveyed before its concept converged, revealing a stable core, an unsettled mechanism, and a periphery that theorists may have mistaken for the center. The dissertation does the same work for attention segregation — constructing the concept before measuring it, so that the indices have something definite to be indices of. Next stages: measurement · validity.