- Staircase learning = Piaget, distinct and different between ages
1. Piagetian stage model = sensorimotor, pre-operational ...
2. Case's Neo-Piagetian stages = sensorimotor, relational, dimensional ...
- overlapping waves learning
1. Wellman's theory of mind = desire theory > belief-desire theory
2. Carey's theory of biology = psychological > biological
3. Ashcraft's single-digit addition model = sum, min, retrieval
4. Seigler's number conservation = length, counting, transformation
- min method = counting from larger addend
- decomposition = dividing problem into two simpler ones