hello everyone!

here are few questions in which i want your help....

what type of research design can be used for studying problems of drug addiction/aids? CE-2006

what type survey research would you use to study heroine users (CE-2003) and to study young ctiminals (CE-2008)

for both parts of Q-2, i think interview is appropriate.. am i correct?

and for Q-1 should it be interview or observation?

regards......