2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85527It is argued that the two problems of choosing characterizations and models of complex systems should not be considered independently. A particular criterion for these choices, oriented on the potential usefulness of the results, is considered, and a generic formalization applicable to realistic experiments is developed. It is applied to Kuramoto-Sivashinsky chaos.4 pages, 2 figuresData Analysis, Statistics and ProbabilityComputational Physicstext