Each stage reflects a shift in how children think, understand, and interact with the world. However, Piaget developed this model in a pre-digital era, where learning was primarily hands-on and ...

Formal operational The formal operational stage is the last phase of Piaget’s stages of development. In this phase, kids begin to think theoretically and start reasoning about hypothetical problems.

Yep, that’s our guy, Jean Piaget. A major product of his research is what he called The Four Stages of Cognitive Development – what we can think of as The Four Stages of Play.

Cyril P. Svoboda, Sources and Characteristics of Piaget's Stage Concept of Development: A Historical Perspective, The Journal of Education, Vol. 155, No. 4 (April/1973), pp. 28-39 ...

Ann L. Brown, Recognition, Reconstruction, and Recall of Narrative Sequences by Preoperational Children, Child Development, Vol. 46, No. 1 (Mar., 1975), pp. 156-166 ...