Children belief-desire reasoning during the preoperational period; this is when the jits realize that their behaviour/behaviour of others is on based on what they believe or desire.
Horizontaldecalage: term coined by piaget when he noted that children's cognitive achievements were ueven; they could solve 1 issue but can't solve another one that's very similar and equal in difficulty
Vygotsky's sociocultural perspective proposed we should evaluate development from 4 interrelated levels of interaction: ontogenetic, microgenetic, phylogenetic and sociohistorical