The articles in this special issue of the "Journal of Cognition and Development" examine the cognitive development of children who are following typical and atypical developmental pathways. The articles offer a mixture of theory-based considerations, reviews of the literature, and new empirical data addressing fundamental aspects of cognitive development. Our commentary considers these articles in light of comparative and dimensional approaches to the study of typicality/atypicality and offers some considerations for researchers building bridges between typical and atypical development.