What performance guidelines should be stated in the policy document of an assessment centre, to certify assessors as competent to act as observers in that assessment centre?

Managerial, supervisory, and executive competence.

Thorough knowledge and understanding of observing and rating behaviour.

The ability to administer exercises as well as to recognise, observe, report and rate behaviour.

Certification in the psychometric tests, included in the assessment centre.

Organisational knowledge and understanding of the organisational culture and its various positions.