Many assessment centres also feature an interview which may be with one person, a panel or with a series of people. At this interview the recruiters may want to probe into areas about which they may have some doubts from the first interview or assessment centre activities.
Remember to prepare well; be informed about the organisation and the position and be prepared to discuss any technical skills you may require for the job. Be enthusiastic about the job and articulate why you wish to work for the organisation.