Selecting staff comprises two main stages: shortlisting and assessment. Throughout both stages employers should ensure that their selection methods treat candidates fairly, without discrimination or bias, and that selections are made based on the candidate’s ability to perform the role, contribute to the organisation and their potential for development.

This factsheet focuses on the assessment stage of the selection process for the employer and candidate, including the role of interviewing as well as other methods such as assessment centres and psychometric testing. It covers the limitations of interviewing and how organisations might avoid common pitfalls. Finally, it takes a closer look at the practicalities of these methods, and pre-employment checks such as references.

Selecting candidates involves two main processes: shortlisting, and assessing applicants to decide who should be made a job offer. This factsheet focuses on interviewing techniques, psychometric testing and assessment centres. For more on the recruitment process generally, see our recruitment factsheet. Our Recruitment and selection law Q&As for CIPD members give more details on UK law.

It’s important to make sure that everyone involved in the selection process, from the shortlisting stage onwards, understands not just the need to avoid unfair discrimination and the potential risk to the organisation’s reputation should a candidate make a tribunal claim, but the benefits a diverse workforce can bring to an organisation.

Our report A head for hiring: the behavioural science of recruitment and selection discusses the way we make decisions and how we have hardwired systematic biases in how we evaluate candidates. This knowledge can help resourcing professionals to improve outcomes and ensure the recruitment process is fair and robust.

Candidates’ applications may arrive as a curriculum vitae (CV) or an application form. Some organisations are using ‘name blind’ recruitment methods to minimise bias from the first stage of the selection process.

There’s a range of factors to consider when choosing a method, including the role itself, available resources and validity of the method. Some are more reliable than others in predicting performance on the job, but may be more resource intensive to administer. Whichever method is used, the candidate experience is important.

Recruiters should tell candidates in advance what to expect from the selection process, including how long it will take, what technology will be used, the type of assessment they will undergo and ensure the process is not unnecessarily long. Employers should also check whether the applicant has any need for adjustments due to a disability. See more on accommodating neurodiversity in the selection process in our Neurodiversity at work report.

Technology plays an increasingly important role in recruitment ranging from attracting candidates through to the selection process. Online recruitment can mean employers receive large numbers of applications, which technology and automation can help manage. And, AI and gamification is increasingly being used to assess potential performance and ability as part of the selection process. Organisations must assess any technology before implementing it; ensuring it has been robustly tested, provides a good candidate experience, and is fair and inclusive. Find out more in our factsheet on Artificial intelligence and automation in the workplace.

After a short-listing process, interviews are very widely used in the selection process, as demonstrated by our successive surveys of recruitment practices. Interviews can be structured in a number of ways, with the most popular method following contents of CVs and application form, according to our latest Resourcing and talent planning survey.

For the employer, the interview is an opportunity to:

  • gauge candidates’ experience and ability to perform in the role
  • explain the employee value proposition, including learning opportunities and employee benefits
  • give the candidate a positive impression of the organisation as a good employer.

For the candidate, the interview is an opportunity to:

  • understand the job and its responsibilities in more detail
  • ask questions about the organisation and the employee value proposition
  • decide whether they would like to take the job if offered it.

Despite their popularity as a selection method, evidence highlights the limitations of the traditional interview and can be prone to bias, especially if information is gathered in a relatively unsystematic manner. Judgements can be made for a variety of reasons that differ between candidates and are not related to the job requirements.

Drawing on a range of research, Anderson and Shackleton summarise the common weaknesses of interviews:

  • The self-fulfilling prophecy effect - Interviewers may ask questions designed to confirm initial impressions of candidates gained either before the interview or in its early stages.
  • The stereotyping effect - Interviewers sometimes assume that particular characteristics are typical of members of a particular group. In the case of sex, race, disability, marital status or ex-offenders, decisions made on this basis are often illegal. However, the effect occurs in the case of all kinds of social groups.
  • The halo and horns effect - Once interviewers rate candidates as ‘good’ or ‘bad’ in some aspects, they often replicate this judgement across the board, reaching unbalanced decisions.
  • The contrast effect - Interviewers can allow the experience of interviewing one candidate to affect the way they interview others who are seen later in the selection process.
  • The similar-to-me effect - Interviewers sometimes give preference to candidates they perceive as having a similar background, career history, personality or attitudes to themselves.
  • The personal liking effect - Interviewers may make decisions on the basis of whether they personally like or dislike the candidate.

Our behavioural science research suggests that to avoid instinctive or hasty judgements interviewers should pre-commit to a set of interview questions that are directly related to performance on the job. Structuring the interview can help improve its ability to predict performance in the job and a growing number of employers take this approach. A structured interview means that:

  • questions are planned carefully before the interview
  • all candidates are asked the same questions
  • answers are scored using a rating system
  • questions focus on the attributes and behaviours needed in the job only.

There is a risk, however, of having an overly rigid approach in which there is little opportunity to ask the candidate supplementary questions and the candidate does not feel at ease, so a balance is needed.

Insights from the interview should be supported by data from other methods where possible, for example psychometric tests or task simulation activities, which could be conducted at interview stage or with technology beforehand.

It’s important that selection interviews are conducted professionally. A poor interview experience can undermine the employer’s brand as candidates might share their unfavourable impression of the organisation with other potential applicants and customers. Following up with candidates in a timely manner, and giving feedback following an interview demonstrates appreciation of their time and enhances the candidate experience.

The use of tests has become an important part of the selection process and can benefit the overall talent management process. Evidence suggests that standardised tests or tests of cognitive ability can be good predictors of job performance, especially for occupations that require complex thinking, although test results should never be the sole basis for a selection decision. See more in our report A head for hiring: the behavioural science of recruitment and selection.

Used correctly, psychometric tests allow employers to systematically assess individual differences (for example in ability, aptitude or personality). They are often administered online, particularly when assessing high volumes of applicants.

Tests should be supported by a body of statistical evidence which demonstrates their validity and reliability. Most tests are developed by occupational psychologists and should be accompanied by detailed manuals that explain how test scores should be used so that employers can compare their test candidates against benchmark scores of similar people (also known as a norm group). Administering tests and analysing the results is a skilled task and requires training and certification; the British Psychological Society set clear standards on testing and test use.

Before using a test, recruiters should:

  • ensure that those involved in administering tests have had appropriate training to do so
  • consider whether it is appropriate to use a test at all (will it provide additional relevant information, and is it relevant to the job/person specification
  • identify who will choose, recommend and assess the value of tests
  • check the copyright of tests and conditions of use
  • decide how the results will be used
  • identify potential equal opportunities issues (that is, whether the tests will disadvantage certain groups, or might need to be adapted)
  • establish a process for giving feedback
  • decide how test results will be stored and who will have access to them.

Job applicants should:

  • be given advance notice to make any practical arrangements to enable them to take the tests
  • be told about test requirements and duration of tests beforehand and have the opportunity to raise queries or request adjustments
  • have access to an appropriate environment in which to take the tests
  • be made aware of feedback arrangements.

It’s also helpful to provide some examples of what the test questions cover and where possible link to practice tests, especially where candidates may not have come across psychometric assessment before (for example, in graduate recruitment).

Assessment centres are used for selection as well as promotion and professional development purposes. They require candidates to complete several different tasks and often combine behavioural ratings, cognitive and personality assessments obtained from multiple sources.

The tasks set should clearly relate to the person specification and reflect the reality of the job. They must be administered in a systematic way, with candidates being given the same types and numbers of tasks to complete in the same time, so that they have equal opportunity to demonstrate their abilities.

Depending on the nature of the job, tasks might include individual or group work, written and/or oral input, and tasks prepared in advance as well as those performed solely on the day. This could involve delivering a report or presentation, time management or task prioritisation exercises, individual problem solving, group discussions, simulations of business activities, or functional role-play.

Assessment centres should be overseen by experienced selectors to ensure objectivity and consistency. Selectors must be trained to observe, actively listen, record, classify and rate behaviour, and seek evidence accurately and objectively against the job description and person specification. They will preferably have had training in interview skills and diversity.

A feedback session with either an occupational psychologist or someone trained to deliver feedback is of benefit to candidates and indicates the organisation is serious about fair selection.

The British Psychological Society’s Division of Occupational Psychology has created a comprehensive standard focused on the design and delivery of assessment centres. Its purpose is to raise the standard of assessment centres by identifying and improving poor practice. The CIPD contributed to this standard which covers: specifying the purpose, scope and designing the centre, the standards of competence and professional behaviour required of the different roles involved, delivery and data integration and decision making, appropriate reporting and feedback of results, managing the data derived including access, use and storage and finally evaluation of centres.

Any offer of employment should be conditional on satisfactory clearance of pre-employment checks such as references from the candidate’s previous employer(s). References should contain factual information such as length of past employment, job title, brief details of responsibilities, overall performance, time-keeping and reason for leaving. However, recruitment decisions should never be based solely on references as they provide a limited perspective of an individual’s suitability for a role. CIPD members can find more legal detail in our References law Q&As.

Additional pre-employment checks are needed if, for example, the job involves working with children or vulnerable adults.


British Psychological Society’s Psychological Testing Centre

International Test Commission

Books and reports

JACKSON, D.J.R., LANCE, C.E. Lance and HOFFMAN, B.J. (eds) (2012) The psychology of assessment centers. New York: Routledge. pp95-120.

NIKOLAOU, I. and OOSTROM, J.K. (eds) (2015) Employee recruitment, selection and assessment: contemporary issues for theory and practice. New York: Psychology Press.

OLIVEIRA, T.C. (2015) Rethinking interviewing and personnel selection. Basingstoke: Palgrave Macmillan.

TAYLOR, S. (2014) Resourcing and talent management. 6th ed. London: Chartered Institute of Personnel and Development.

Visit the CIPD and Kogan Page Bookshop to see all our priced publications currently in print.

Journal articles

GUINN, S.L. (2013) Predicting successful people. Strategic HR Review. Vol 12, No 1. pp26-31.

JACOBS, K. (2018) Is psychometric testing still fit for purpose?People Management (online). 22 February.

NGA, E. and SEARS, G. (2010) The effect of adverse impact in selection practices on organizational diversity: a field study. International Journal of Human Resource Management. Vol 21, No 9. pp. 1454-1471.

STONE, D. L., LUKASZEWSKI, K. M., and STONE-ROMERO, E. F. (2013). Factors affecting the effectiveness and acceptance of electronic selection systems. Human Resource Management Review. Vol 23, No 1, March. pp1-21.

SUFF, R. (2012) Employers' use of psychometric testing in selection: 2012 XpertHR survey. IRS Employment Review. 30 May. 9pp.

UPADHYAY, A.K. and KHANDELWAL, K. (2018) Applying artificial intelligence: implications for recruitment. Strategic HR Review. Vol 17, No 1. pp255-258.

CIPD members can use our online journals to find articles from over 300 journal titles relevant to HR.

Members and People Management subscribers can see articles on the People Management website.

This factsheet was last updated by Melanie Green.

Melanie Green: Research Adviser

Melanie joined the CIPD in 2017, specialising in learning & development and skills research. Prior to the CIPD, Mel worked as an HR practitioner in a technology organisation, working on a variety of learning and development initiatives, and has previously worked as a researcher in an employee engagement and well-being consultancy. 

Melanie holds a master’s degree in Occupational Psychology from University of Surrey, where she conducted research into work–life boundary styles and the effect of this on employee well-being and engagement.