His account differs radically from Piaget's because he rejects any strong sense of stage development. Qualitative differences in thought appear to exist at different ages, because children tend to move up to more sophisticated strategies at the same age. He suggests that a more detailed analysis of cognitive development would reveal a smoother developmental progression. IP versus Piaget IP account has many advantages over Piagetian account. It is far more explicit and precise about the various processes involved in cognition and the ways in which they interact.
Cognitive performance is broken down into a set of distinct, sequentially operating processes.
But, danger of loosing sight of the wood for the trees. IP has failed to build the minute detail of task analyses into a general theory of cognitive development. So some IP theorists have chosen to base their accounts on Piaget's. According to Fischer the development of cognition involves the acquisition of skills for representing and mentally manipulating information about objects and events in the world.