This document discusses theories related to how children learn foreign languages. It covers Piaget's view that children are active learners who construct their own knowledge through interacting with their environment. Vygotsky's socio-cultural theory emphasizes that learning and development occur through social interaction and instruction. Bruner's work showed that scaffolding and routines in the classroom can help children attend to relevant information, adopt useful strategies, and remember goals through modeling, focusing activities, praise, and reminders. The document stresses that understanding child development and applying these theories can help maximize foreign language learning.