Good casting contributes massively to the success of any film. Beginning directors often do it poorly by settling for the first person who seems right or who is reliable.
The object of auditioning is to find out as much as you can about the physical, psychological, and emotional make-up of each potential cast member so you can commit yourself confidently to the best choice. Doing this means initially putting many actors through a brief procedure to reveal their character and to indicate how each handles representative situations. Later there will be semifinal and final rounds of auditioning. The first aim is to identify broad characteristics: