The mnemonic
Some Parents Can Fail
What each word stands for
- SomeSensorimotor (0 to 2 years)
- ParentsPreoperational (2 to 7 years)
- CanConcrete operational (7 to 11 years)
- FailFormal operational (11 years onward)
Why it matters clinically
Object permanence develops in the sensorimotor stage; conservation in the concrete operational stage.
Where it stops being reliable
Ages are approximate and children vary.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.