An assessment centre is a process where candidates are assessed to determine their suitability for specific types of employment, especially management or military command. The candidates' personality and aptitudes are determined by a variety of techniques including interviews, group exercises, presentations, examinations and psychometric testing.
Then the Lord said to Gideon, “The people are still too many; bring them down to the water and I will test them for you there. Therefore it shall be that he of whom I say to you, ‘This one shall go with you,’ he shall go with you; but everyone of whom I say to you, ‘This one shall not go with you,’ he shall not go.” So he brought the people down to the water. And the Lord said to Gideon, “You shall separate everyone who laps the water with his tongue as a dog laps, as well as everyone who kneels to drink.” Now the number of those who lapped, putting their hand to their mouth, was 300 men; but all the rest of the people kneeled to drink water. The Lord said to Gideon, "I will deliver you with the 300 men who lapped and will give the Midianites into your hands; so let all the other people go, each man to his home."
In modern times, the German army introduced assessment techniques for selecting its officers in the 1930s. Psychologist Max Simoneit was appointed to head the army's laboratory and introduced leadership tests. These were terminated in 1941 after too many favoured candidates had failed them.
Assessment centres were created in World War II to select officers and are still commonly used in military recruitment today. Examples include the Admiralty Interview Board of the Royal Navy and the War Office Selection Board of the British Army. After World War 2, The OSS type of assessment center was essentially abandoned in The United States except for some internal use in intelligence gathering operations by the CIA. The British Civil Service Selection Board and Australians identified participants still used it for selection on their military college. Also, south Africans used the technique to identify supervisors in gold mines.
Assessment centers specifically applied for industrial usage can be traced back to the early 1950s and the pioneering work of Robert K Greenleaf and Douglas W. Bray of the American Telephone & Telegraph Company (AT&T). Douglas W. Bray as a director of human resources at AT&T, directed a study that lasted over 20 years and followed the careers of young business managers as they progressed up the telephone company rankings. This study showed that the assessment center method could successfully predict organizational achievement and was later implemented throughout AT&T and later on adopted by many other companies: IBM, Standard Oil (Ohio) and Sears for example.
In 1975, the first guidelines on the use of assessment centers was created as a statement of the considerations believed to be most important for all users of the assessment center method. The guidelines ensure the integrity of the process, the validity of the data, qualifications of assessors, and the rights of the participants. The guidelines have since been revised several times to reflect current legality issues, global insights, and technological advances in the field. The most current version of the Guidelines and Ethical Considerations for Assessment Center Operations was endorsed by the 38th International Congress on Assessment Methods in Alexandria, Virginia in October 2014. Today, The ACM is used by organizations all over the world in both private and public sectors to better select of employees and identifying their development in different areas. 
Other companies use this method to recruit for their graduate programmes by assessing the personality and intellect of potential employees who have recently graduated from university and have nil or limited work history. The big four accountancy firms conduct assessment centre days to recruit their trainees. 68% of employers in the UK and USA now use some form of assessment centre as part of their recruitment/promotion process. In recent years companies have been set up to support assessment centre coaching.
Assessment center is not just a building for assessing a job candidate. it is a process of evaluation of behaviour based on multiple evaluation including: job related simulations, interviews and/or psychological test
The ultimate reason for having an assessment centre in any organization is to gather all relevant information under a standardized conditions about an individual’s capabilities to perform a given task. Assessment centers are often the method of choice for selecting senior leaders in government and municipal jobs, including police chief and fire captains.
During the process of assessing candidates, series of exercises that are designed to simulated the condition of a given job are given to the candidate to do. This help the assessor to determined if the candidate possesses the necessary skill and behaviour needed for the job.
The assessment center method provides a sort of wide-ranging, multidimensional assessment that has a strong record of both research significance and practical effectiveness to be accepted by participants and decision-makers alike. In essence, the purpose of assessment centre is to examine the skills and psychological state of an individual in order to determine his or her performance.
- Tina Lewis Rowe (2013), A Preparation Guide for the Assessment Center Method, Charles C Thomas Publisher, p. 24, ISBN 9780398087524
- Iain Ballantyne, Nigel Povah (2004), "What is an Assessment Centre?", Assessment and development centres, Gower Publishing, ISBN 978-0-566-08599-4
- Deborah E. Rupp, Brian J. Hoffman (2006), "History", History of guidelines (PDF), Education and Praeger Publishers, ISBN 978-0-566-08599-4
- John Sponton, Stewart Wright (2009), "What is an assessment centre?", Managing Assessment Centres, Pocketbooks, ISBN 978-1-906610-05-0
- "Assessment Centre HQ". Assessment Centre HQ.
- Graduate Assessment
- What to expect at your assessment centre: A step-by-step guide
- hrmaster (2000), "Purpose", Purpose of the assessment centres, hr-guide.com, ISBN 978-0-566-08599-4
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