<prompt> Age group for concrete operational stage:0-2 yrs2-6 yrs7-12 yrs11-15 yrs  <response>: According to Piaget Cognitive theory, the sequence of development has been categorized into 4 major stages. Sensorimotor stage 0 to 2 yrs Pre-operational stage 2 to 6 yrs Concrete operational stage 7 to 12 yrs Formal operational stage 11 to 15 yrs 