According to Social Interactionist Theory, whose interactions are key to development?

• A. Only siblings
• B. Adults and peers
• C. Pets
• D. None

Answer: (B)

Social Interactionist Theory argues that development happens through social engagement and language-based learning. Learners grow when they participate in meaningful interactions with others who can model strategies, provide feedback, and guide problem solving. Adults often supply scaffolding—hinting, prompting, and structuring tasks—that helps a learner reach beyond what they can do alone, a process captured by the idea of the zone of proximal development. Peers also play a crucial role by engaging in dialogue, negotiating meanings, and practicing language and reasoning in collaborative ways. Because the theory centers on social input and collaborative learning, interactions with both adults and peers are the key drivers of development. Non-human agents like pets don’t provide the structured social support described by this framework.