“…But a theory is nothing without an adequate and representative set of observations, and it is here that we are still lacking (for a parallel discussion in the evolutionary social sciences, see Clark Barret, 2020a). Good descriptive data have always had a major role in child language research, with major initiatives like the Child Language Data Exchange System (CHILDES) (MacWhinney, 2000) allowing us, among other things, to directly observe the input data children have at their disposal to acquire language, and the range of unique problems they must solve along the way (as in the Eegima demonstrative system, Sagna et al, 2022). Further description better maps the problem space facing the child and gives us a first look at how they navigate it, providing crucial data for further refinement of theory, which is sorely needed in the psychological and cognitive sciences (see Scheel, 2022).…”