what are the merits and demerits of Interview method with examples?

What jesnas subdivided into was more like ways of
interacting or media. Interviews really subdivide into unstructured, semi structured and
structured.  You can use all  of the media for each of
these.

Unstructured is when you have no plan just an idea
or an intersting person etc --chat and find out where it goes--great for new topics
etc.  Semi structured has a spine that you want to follow e.g. A to B via Z and you can
stray on and off as things develop but you get back on track eventally, Structured is
much like a set questionnaire.

jesnas highlighted some of
the strengths and weaknesses but omitted a couple of biggys.  Potential to lead the
respondent is one.  By skillful prompt you can lead the respondend where you want and
get the answer you want. Selection bias is another, picking peole who may give the
responses you want.  There is also (mentioned by jesnas in part) social desirability
bias, people may want to look good in the interviewer's eyes, or may not give their real
thoughts because it is again what decent people think.

The
big plus side is no other method can gather such rich data as an interview done
well.

Silverstrummer