Answer:
Primary , method involves gathering data that has not been collected before. Methods to collect it can include interviews, surveys, observations or any type of research that you go out and collect yourself.
Questionnaires can cover every aspect of a topic. One of the biggest advantages is being able to ask as many questions as you like. Of course, it benefits the marketer to keep each individual questionnaire short, since respondents may find a long questionnaire frustrating.
Strengths:
More natural behaviour occurs if people are unaware of observation. Observer may affect behaviour if detected.
Wekness:
Studying of animals that cannot be observed in captivity. Difficult to replicate - cannot control extraneous variables
