Noted developmental psychologist jean piaget based his theory in large part on in-depth examinations of his own three children. piaget's work exemplifies the research method.

Piaget's work exemplifies the 'experimental method’ research method. The Piaget's ‘experimental method’ had three steps:

hypothesis testing

strict control of experimental variables

treatment of data with specifically designed statistical procedures.

Piaget's early methodology has been often criticised for many different reasons, and among them was the fact that the methodology was observational rather than experimental. Piaget's ‘experimental method’ later developed and became known as the ‘clinical method’.

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