To a certain extent, the interview is a game that requires role-playing and broad adherence to an unwritten set of rules.
It is likely that you may be talking for at least two thirds of the interview, as it is the interviewer who wishes to gather information about you. It is important, therefore, that you are precise and offer detailed and exact answers to questions without waffling. It is impossible to over-emphasise the importance of sounding enthusiastic and interested in the organisation, the opening, and your career. Nothing is more off putting than a candidate who lacks any spark of life. All employers are looking for employees who cannot only efficiently carry out the work, but who will be able to add something to the organisation. Try to keep the conversation flowing and be positive with your replies.
How you, as an individual, appear to the interviewer is crucial. Appearing over-confident, cocky and that you are doing the firm a favour turning up, is going to create a disastrous impression as will demonstrating a lack of confidence, false modesty and underselling yourself. Part of the essential make-up of any professional is giving the appearance of competence and confidence in one's ability. Ensure you are positive about your own attributes and skills.
Do not be negative about a present or past employer. You may have had a bad experience with an employer, but appearing bitter about your experiences will convey the view that you may be awkward and not a good team player.
