References:

Books:

• Piaget, J. (1964). Cognitive development in children: Piaget.Journal of research in science teaching, 2(3), 176-186.
   
• Piaget, J. (2013). Play, dreams and imitation in childhood (Vol. 25). Routledge.
   
• Chaiklin, S. (2003). The zone of proximal development in Vygotsky’s analysis of learning and instruction. Vygotsky’s educational theory in cultural context, 1, 39-64.
   
• Cole, M., John-Steiner, V., Scribner, S., & Souberman, E. (1978). Mind in society. Mind in society the development of higher psychological processes. Cambridge, MA: Harvard University Press.
   
• Gardner, H. (2011). Frames of mind: The theory of multiple intelligences. Hachette Uk.

Web:

• fraction Maths.
  https://play.google.com/store/search?q=fraction+Maths

Other Links:

• Useful resource e-links related to 'Interaction Design'
• Interaction Design at IDC, IIT Bombay

Case Study Download:
• Let's Learn Fraction - A Toolkit......