Which of the following is classified in the category of developmental research?

Developmental research studies patterns of growth and change and can draw on several research forms.

Philosophical research contributes reasoned frameworks that guide developmental understanding.

Action research feeds developmental improvement by testing interventions in real settings.

Descriptive research charts developmental characteristics across ages or stages over time.

Because each form can serve the study of development, all of them together give the fullest account.

Cross-sectional and longitudinal designs are the classic tools of developmental study.