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Nature
Heredity
Twin studies
Nurture
Environment
Adoption studies
Maturation
Unfolding of a natural sequence of changes
Normative Events
Influence most people in a society
Normative Age-Graded
Type of normative event that is specific to an age group
Normative History-Graded
Type of normative event that is specific to a timeline
Reactive
Mechanistic model
Humans are machines being operated by the environment
John Locke’s Tabula Rasa
Active
Organismic model
Jean Jacques Rousseau
Instincts and individual potential; we set our own development
Continuity
Gradual
Incremental
Quantitative change
Discontinuity
Abrupt
Qualitative change
Stage oriented theories