Biography
Piagetian “Staircase” Model (Discontinuous, Homogeneous Stages):
Stage 4: [Formal Operations] ————————| (Age 11+)
Stage 3: [Concrete Operations] ————–|
Stage 2: [Preoperational] ——–|
Stage 1: [Sensorimotor] ——|
(Universal leaps; intra-individual variability treated as anomalous “decalage”)
Siegler’s Overlapping Waves Model (Continuous, Dynamic Strategy Competition):
Usage %
100% | Strategy 1 Strategy 2 Strategy 4
| (Count-All) (Min-Count) (Retrieval)
50% | / /
| / / / /
| / / / // /
0% |_______________/___/_____/_____/_______
Chronological Age / Experience