Naturalistic Observation:This is a research method often used by psychologists and other social scientists where subjects are observed in their natural habitat without any manipulation by the observer.
Participant Observation: This is an observational methodology where the observer takes part in the activities of the group or community they are observing to gain a deeper understanding of their behavior.
Non-participant Observation: In this type of observation, researchers do not become part of the group they are studying. They maintain distance and observe as outsiders.