Final answer:
Case studies, longitudinal research, and naturalistic observation are commonly used research methods in human development studies.
Explanation:
Case studies are commonly used in the study of human development. They involve in-depth, detailed examinations of a single individual or a small group over an extended period. This method allows researchers to gather rich, qualitative data and explore complex behaviors and processes.
Longitudinal research is another method frequently used in the study of human development. It involves studying the same group of individuals over a long period, allowing researchers to observe changes and continuity in behavior and development.
Naturalistic observation is also common in human development research. This method involves observing individuals in their natural environments without interference, providing insights into how people behave in real-life settings.
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