This article describes formative and design experiments and how they can advance research and instructional practices in early childhood education. We argue that this relatively new approach to education research closes the gap between research and practice, and it addresses limitations that have been identified in early childhood research. We provide examples of this approach's potential benefits, trace its origins, present its defining characteristics, illustrate a representative framework for conducting a formative experiment using an example from our own work and we argue that formative and design experiments introduce useful new metaphors into early childhood research.