The most important aim of conducting an interview is to form an impression of a candidate’s personality and abilities. To do this, you must supplement the information gained from their CV, so ask perceptive questions and take note of your impressions.
Remember that the “best” candidate may just be good at interviews.
Before the interview begins in earnest, you will have already formed an impression of the candidate. Be aware of any prejudices that might colour your first impression of them: perhaps you are adversely affected by long hair, by a particular accent, or by a style of dress. Similarly the interviewee will have formed an opinion about your company. An unfavourable impression is ...