The assessment centre is traditionally used for large scale or bulk recruitment exercises. Assessment centres vary in complexity and are typically conducted by trained consultants. They can be expensive and complex to administer and are usually more cost effective when recruiting large numbers of people.
A typical assessment may run over the course of one or two days and involve trained assessors evaluating a number of candidates using a range of techniques such as interviews, written tests and individual and group exercises. Assessors assimilate evidence from candidate performance across all exercises and incorporate this into a final collective decision.