Naturalistic
behaviour is observed in an environment which has not been manipulated
Controlled
researcher controls the setting
Structured
researcher records all relevant behaviour with a system
Unstructured
researcher records all relevant behaviour without a system
Participant observation
observer acts as part of the group being watched
Non-participant observation
observer does not become part of the group being observed
Strengths of overt
more ethically viable, informed consent can be given
Strengths of covert