It is important to be yourself. The selectors will not have a quota of 3 or 4 from each group, if they think all 8 have the right qualities, then all 8 will be accepted. Deciding on the right moment to be a leader or to take advice or direction from another is something that is an innate quality. It is quite common for employers to use a style of questioning known as behavioural based interviewing. The essence is that they wish to know how you have behaved or responded to circumstances in the past.
Past behaviour is a predictor of future behaviour.
Expect the employer to keep digging to seek from you exactly your role or contribution in a given situation. Telephone With the telephone an important element of the communication process is missing - your body language. Consequently you need to project your enthusiasm for the position by projecting energy in your voice. The most important component of interview performance is communication. Don't just stick to a predetermined answer, make sure you have understood what exactly it is the employer is asking of you, and project your enthusiasm for the role through your tone and body language.