Representative of pop. Short recruitment questionnaire - emphasise imp. of issue, no special knowledge required. But within groups may be important to restrict age, social class, gender, so people will talk freely. Superficial responses questioned by others, ideas need justification. Psych training - Encourage exchange of ideas, get people to speak their minds, react to other people s responses.
Group behaviour differs from individual behaviour.
Groups take on a life of their own. Neutral, comfortable surroundings. Best if moderator involved, as can remember gestures, expression, body language. Reporting - usually identify ideas, attitudes commonly held, rather than how many said what. Or else use exception.