What makes unique of being a participant-observation is that they seek to become part of a study group while the group is unaware of the researchers through identity and you must learn to walk the walk and talk the talk in order can be fully accepted and gain the confidence of the group and of course not being biased as an outsider

What makes unique of being a participant-observation is that they seek to become part of a study group while the group is unaware of the researchers through identity and you must learn to walk the walk and talk the talk in order can be fully accepted and gain the confidence of the group and of course not being biased as an outsider. I believe that the research that  Claire Sterk conducted on female prostitution and the struggles they may face was very alarming and critical to the trade and general awareness of the public. I found it interesting because she was actually integrating herself 

I think the particular challenges and ethical issues, and one of the central issues is cultural relativism