If you are unsure of the employer's range let the employer be the one to start naming figures. If the interviewer suggests the possibility of getting approval for more money, make an appointment for further negotiations as soon as possible. If you don't, the person may put off the unpleasant task of sticking their neck out for you - or avoid it entirely by hiring someone else. If the salary can't be increased and you still want the job, negotiate for a salary review in three to six months. You Want Many decision-makers like to drive hard bargains.
People find it difficult to be hard-nosed about their own sense of fairness.
If hired, don't tell anyone at your new job what you make, how big of an increase you got over your previous salary, or about special perks or fringe benefits you are receiving. Salaries for the same type of position don't vary greatly from company to company within an industry.