Answer:
The answer is non-participant observation method.
Step-by-step explanation:
In this method, the researcher is not part of the group being studied. The reseracher must decide beforehand if the study is realistic, ethical and relevant for the research. Among the many different ways to carry out this method, it is posible for the researcher to observe a group at different times and locations, for short periods.
It is also important for the researcher to record not only the behaviour observed, but also the type of behaviour that did NOT occur.