Preparation is key. You would expect that the candidate will have prepared for the interview and be well versed on the role and the organisation.
It is equally important that you make the time to prepare.
An interview is an investment of time for both the interviewer and the interviewee, so make sure the time is well spent by preparing for the conversation.
If you do nothing else, make sure you read the candidate’s resume. Candidates put a lot of time and effort into their resume, and it is very disheartening to meet with an interviewer who has not taken the time to read it.