The biggest difference between vygotsky's approach to development and that of piaget and the information-processing approach is that vygotsky placed more emphasis on

I believe the answer is: Socio cultural influence on development

Vygotsky believe that social interaction with other people plays a really huge role in determining how our cognitive skills are developed. According to him, children who grow up and constantly interact with other people who see bad behaviours as normal would most likely perceive theme as normal too as they grow.