Piaget's term for uneven progress, where a child solves one task of a stage but not a similar one:

1. Piaget's stage model predicts that a child at one stage should solve all tasks of that stage. 2. In practice, a child may conserve number years before volume. 3. Piaget himself named this unevenness **décalage** (horizontal when it is within one stage). 4. Critics use décalage to argue the stage model is at best a useful approximation. 5. It also supports the wider criticism that development is not domain general but differs across areas of knowledge. 6. So the term for uneven progress is décalage. **Why the other options fail:** - Equilibration is the balancing drive, centration is a preoperational limit and accommodation is changing a schema; none names uneven progress. _Source: Wikipedia, "Piaget's theory of cognitive development", section "Challenges to Piagetian stage theory" (revision 1379038101)_