They give you a list of possible questions. Let you look at them and think/write your answers. Then a panel of three people interviews you. The panel usually is made of the supervisor, an employee who has a similar position, and an HR employee.

Phone interview with manager to determine if you are adequate for the job. If you pass, then there is a face to face interview with manager and usually one or more people. You are asked your qualifications and why you want to work there. You will be asked to defend qualifications such as to how you meet the requirements for the job.