Which Of The Following Modes Of Observation Does Not Require The Researcher To Intrude To Some Degree On Whatever He Or She Studies?

Which Of The Following Modes Of Observation Does Not Require The Researcher To Intrude To Some Degree On Whatever He Or She Studies? Unobtrusive measures are measures that don’t require the researcher to intrude in the research context. Direct and participant observation require that the researcher be physically present. What type of research does not