Which Russian psychologist researched social development theory, introducing the concepts of a more knowledgeable other (MKO) and the zone of proximal development (ZPD)?

• A. Theoretical Framework
• B. Vicarious Learning
• C. Creative Thinking
• D. Lev Vygotsky

Answer: (D)

This item tests understanding of sociocultural theory and the ideas of learning through social interaction. Lev Vygotsky, a Russian psychologist, is the one who introduced the concept of a more knowledgeable other and the zone of proximal development. The zone of proximal development is the range between what a learner can do alone and what they can do with guidance or support. The more knowledgeable other is anyone who has greater understanding and can provide that support, or scaffolding, to help the learner progress to higher levels of understanding. This emphasis on social context and guided interaction is central to how learning is seen as a collaborative process that leads development.

The other options don’t fit because they refer to different ideas or terms. Theoretical Framework isn’t a person or a specific theory about how children learn in social contexts. Vicarious Learning relates to observing others’ actions and outcomes (a concept from another theory), rather than the structured guidance and social interaction emphasized by this approach. Creative Thinking is a general cognitive skill area, not a theory about social development.