Chapter 4: Assessment Tools and Their Uses

This chapter briefly describes different types of assessment tools and procedures that organizations commonly use to conduct personnel assessment. Included are techniques such as employment interviews and reference checks, as well as various types of professionally developed assessment instruments. This chapter also includes a discussion of the use of medical tests and drug and alcohol testing in the workplace. Table 4, which appears at the end of this chapter, contains a brief description of the advantages and disadvantages of different types of assessment instruments.

Chapter Highlights

  1. Mental and physical ability tests
  2. Achievement tests
  3. Biodata inventories
  4. Employment interviews
  5. Personality inventories
  6. Honesty and integrity measures
  7. Education and experience requirements (including licensing and certification)
  8. Recommendations and reference checks
  9. Assessment centers
  10. Medical examinations
  11. Drug and alcohol tests

Principles of Assessment Discussed It takes a good deal of knowledge and judgment to properly use assessment tools to make effective employment-related decisions. Many assessment tools and procedures require specialized training, education, or experience to administer and interpret correctly. These requirements vary widely, depending on the specific instruments being used. Check with the test publisher to determine whether you and your staff meet these requirements. To ensure that test users have the necessary qualifications, some test publishers and distributors require proof of qualifications before they will release certain tests.

Mental and physical ability tests

When properly applied, ability tests are among the most useful and valid tools available for predicting success in jobs and training across a wide variety of occupations. Ability tests are most commonly used for entry-level jobs, and for applicants without professional training or advanced degrees. Mental ability tests are generally used to measure the ability to learn and perform particular job responsibilities.

Examples of some mental abilities are verbal, quantitative, and spatial abilities. Physical ability tests usually encompass abilities such as strength, endurance, and flexibility.

Although mental ability tests are valid predictors of performance in many jobs, use of such tests to make employment decisions often results in adverse impact. For example, research suggests that mental abilities tests adversely impact some racial minority groups and, if speed is also a component of the test, older workers may be adversely impacted. Similarly, use of physical ability tests often results in adverse impact against women and older persons. See Chapter 7 for strategies to minimize adverse impact in your assessment program.

Achievement tests

Achievement tests, also known as proficiency tests, are frequently used to measure an individual's current knowledge or skills that are important to a particular job. These tests generally fall into one of the following formats:

Biodata inventories

Biodata inventories are standardized questionnaires that gather job-relevant biographical information, such as amount and type of schooling, job experiences, and hobbies. They are generally used to predict job and training performance, tenure, and turnover. They capitalize on the well-proven notion that past behavior is a good predictor of future behavior.

Some individuals might provide inaccurate information on biodata inventories to portray themselves as being more qualified or experienced than they really are. Internal consistency checks can be used to detect whether there are discrepancies in the information reported. In addition, reference checks and resumes can be used to verify information.

Employment interviews

The employment interview is probably the most commonly used assessment tool. The interview can range from being totally unplanned, that is, unstructured, to carefully designed beforehand, that is, completely structured. The most structured interviews have characteristics such as standardized questions, trained interviewers, specific question order, controlled length of time, and a standardized response evaluation format. At the other end of the spectrum, a completely unstructured interview would probably be done "off the cuff," with untrained interviewers, random questions, and with no consideration of time. A structured interview that is based on an analysis of the job in question is generally a more valid predictor of job performance than an unstructured interview. Keep in mind that interviews may contain both structured and unstructured characteristics.

Regardless of the extent to which the interview is structured or unstructured, the skill of the interviewer can make a difference in the quality of the information gathered. A skillful, trained interviewer will be able to ask job-relevant follow-up questions to clarify and explore issues brought up during the interview.

It is unlawful to ask questions about medical conditions and disability before a conditional job offer. Even if the job applicant volunteers such information, you are not permitted to pursue inquiries about the nature of the medical condition or disability. Instead, refocus the interview so that emphasis is on the ability of the applicant to perform the job, not on the disability. In some limited circumstances, you may ask about the need for reasonable accommodation.

Where disability is concerned, the law requires that employers provide reasonable accommodations (meaning a modification or adjustment) to a job, the work environment or the way things are usually done so that qualified individuals with a disability are not excluded from jobs that they can perform. These legal requirements apply to all selection standards and procedures, including questions and rating systems used during the interview process.

Following a structured interview format can help interviewers avoid unlawful or inappropriate inquiries where medical conditions, disability, and age are concerned. For additional information on the ADA, see the EEOC Technical Assistance Manual on the Employment Provisions of the Americans with Disabilities Act and the EEOC ADA Enforcement Guidance: Preemployment Disability -Related Questions and Medical Examinations.

It is important to note that inquiries about race, ethnicity, or age generally are not expressly prohibited under the law, but usually serve no credible purpose in an interview. These types of questions are also closely scrutinized by organizations, including regulatory agencies, interested in protecting the civil rights of applicants.

Personality inventories

In addition to abilities, knowledge, and skills, job success also depends on an individual's personal characteristics. Personality inventories designed for use in employment contexts are used to evaluate such characteristics as motivation, conscientiousness, self-confidence, or how well an employee might get along with fellow workers. Research has shown that, in certain situations, use of personality tests with other assessment instruments can yield helpful predictions.

Some personality inventories have been developed to determine the psychological attributes of an individual for diagnostic and therapeutic purposes. These clinical tools are not specifically designed to measure job-related personality dimensions. These tests are used in only very limited employment situations, primarily with jobs where it is critical to have some idea about an applicant's state of mind, such as in the selection of law enforcement officers or nuclear power plant workers. This distinction between clinical and employment-oriented personality inventories can be confusing. Applicants asked to take personality tests may become concerned even though only employment-oriented personality inventories will be administered.

If a personality inventory or other assessment tool provides information that would lead to identifying a mental disorder or impairment, the tool is considered a medical exam under the ADA. The ADA permits medical examinations of applicants and employees only in limited circumstances.

There are a few additional concerns about personality tests. Since there are usually no right or wrong answers to the test items, test takers may provide socially desirable answers. However, sophisticated personality inventories often have "lie-scales" built in, which allow such response patterns to be detected. There is also a general perception that these tests ask personal questions that are only indirectly relevant to job performance. This may raise concern on the part of test takers that such tests are an invasion of privacy. Some of these concerns can be reduced by including personality tests only as one part of a broader assessment program.

Honesty and integrity measures

Honesty tests are a specific type of personality test. There has been an increase in the popularity of honesty and integrity measures since the Employee Polygraph Protection Act (1988) prohibited the use of polygraph tests by most private employers. Honesty and integrity measures may be broadly categorized into two types.All the legitimate concerns and cautions of personality testing apply here. For instance, test takers may raise privacy concerns or question the relevance of these measures to job performance. If you choose to use an honesty test to select people for a particular job, you should document the business necessity of such a test. This would require a detailed job analysis, including an assessment of the consequences of hiring a dishonest individual. Make certain that your staff have the proper training and qualifications to administer and interpret integrity tests.

It is generally recommended that these tests be used only for pre-employment screening. Using the test with present employees could create serious morale problems. Using current employees' poor scores to make employment decisions may have legal repercussions when not substantiated by actual counterproductive behavior.

All honesty and integrity measures have appreciable prediction errors. To minimize prediction errors, thoroughly follow up on poor-scoring individuals with retesting, interviews, or reference checks. In general, integrity measures should not be used as the sole source of information for making employment decisions about individuals.

A number of states currently have statutes restricting the use of honesty and integrity measures. At least one state has an outright ban on their use. Consult regulations in your state that govern the use of honesty and integrity tests before using them.

Education and experience requirements (including licensing and certification)

Most jobs have some kind of education and experience requirements. For example, they may specify that only applicants with college degrees or equivalent training or experience will be considered. Such requirements are more common in technical, professional, and higher-level jobs. Certain licensing, certification, and education requirements are mandated by law, as in the case of truck drivers and physicians. This is done to verify minimum competence and to protect public safety.

Requirements for experience and education should be job-related. If the requirements you set result in adverse impact, you will have to demonstrate that they are job-related and justified by business necessity. However, in some cases job-relatedness might be difficult to demonstrate. For example, it is difficult to show that exactly 3 years of experience is necessary or demonstrate that a high school degree is required for a particular job.

Recommendations and reference checks

Recommendations and reference checks are often used to verify education, employment, and achievement records already provided by the applicant in some other form, such as during an interview or on a resume or application form. This is primarily done for professional and high-level jobs.

These verification procedures generally do not help separate potentially good workers from poor workers. This is because they almost always result in positive reports. However, use of these measures may serve two important purposes

Assessment centers

In the assessment center approach, candidates are generally assessed with a wide variety of instruments and procedures. These could include interviews, ability and personality measures, and a range of standardized management activities and problem-solving exercises. Typical of these activities and exercises are in-basket tests, leaderless group discussions, and role-play exercises. Assessment centers are most widely used for managerial and high level positions to assess managerial potential, promotability, problem-solving skills, and decision-making skills.Assessors must be appropriately trained. Their skills and experience are essential to the quality of the evaluations they provide. Assessment centers apply the whole-person approach to personnel assessment. They can be very good predictors of job performance and behavior when the tests and procedures making up the assessment center are constructed and used appropriately.

It can be costly to set up an assessment center. Large companies may have their own assessment centers; mid-size and smaller firms sometimes send candidates to private consulting firms for evaluation.

Medical examinations

Medical examinations are used to determine if a person can safely and adequately perform a specific job. Medical exams may also be part of a procedure for maintaining comprehensive employee health and safety plans. In some limited circumstances, medical exams may be used for evaluating employee requests for reasonable accommodation for disabilities.

The Americans with Disabilities Act outlines when and in what manner medical exams can be used in employment-related situations. For additional information on the ADA, see Chapter 2 of the Guide, the EEOC Technical Assistance Manual on the Employment Provisions of the Americans with Disabilities Act, the EEOC ADA Enforcement Guidance: Preemployment Disability - Related Questions and Medical Examinations, and the EEOC Uniform Guidelines on Employee Selection Procedures. Some major points regarding medical exams are described below.

If your organization uses medical information to make personnel decisions, you should develop a written policy on medical testing to ensure compliance with relevant federal, state, and local laws. For additional information on the ADA, see the EEOC Technical Assistance Manual on the Employment Provisions of the Americans with Disabilities Act, and the EEOC ADA Enforcement Guidance: Preemployment Disability - Related Questions and Medical Examinations.

Drug and alcohol tests

An employer may prohibit the use of alcohol and illegal drugs at the workplace and may require that employees not be under the influence of either while on the job. Some commonly reported negative work behaviors and outcomes associated with alcohol and drug abuse are industrial accidents, work-related injuries, excessive absenteeism or tardiness, and workplace violence.

Current use, possession, or distribution of illicit drugs does not qualify as a "disability" under the ADA. You may prohibit the use of such drugs at the workplace, and you may administer drug tests to applicants and employees alike. You may deny employment to an applicant and discipline or discharge an employee currently engaged in illegal drug use. However, you may not discriminate against a former drug addict who has successfully undergone rehabilitation and does not currently use illicit drugs.

If your organization is in the public sector, federal courts have generally upheld the use of random drug tests only when applied to safety-sensitive positions. This federal restriction does not apply if you are a private employer. However, state or local laws and collective bargaining agreements pertaining to drug testing may impose restrictions on your drug testing policy.

Some legal medications or even some foods can produce a positive reading on a drug screening test for an individual who, in fact, has not used illegal drugs. To minimize such errors, it is advisable to have a formal appeals process, and also provisions for retesting with a more sensitive drug test when necessary.

Under the ADA, a test for the illegal use of drugs is not considered a medical exam, but a test for alcohol use is. Therefore, you must follow the ADA rules on medical exams in deciding whether and when to administer an alcohol test to applicants or employees.

Alcoholism may qualify as a disability under the ADA, and hence an individual with this condition may be extended protection. However, organizations may discipline individuals who violate conduct or performance standards that are related to the job. Organizations also may discharge, or deny employment to individuals whose use of alcohol impairs job performance or compromises safety to the extent that he or she can no longer be considered a "qualified individual with a disability."

If your organization uses drug or alcohol tests to make personnel decisions, you should develop a written policy governing such a program to ensure compliance with all relevant federal, state, and local laws. Most states require written consent of employees and applicants before drug or alcohol tests can be administered. Consult the ADA, the EEOC Technical Assistance Manual on the Employment Provisions of the Americans with Disabilities Act, the EEOC ADA Enforcement Guidance: Preemployment Disability - Related Questions and Medical Examinations, and the EEOC Uniform Guidelines on Employee Selection Procedures, as well as your state and local laws when developing a drug or alcohol testing program.

Table 4. Main Advantages and Disadvantages of Different Types of
Assessment Instruments

Type of assessment instrumentAdvantagesDisadvantages

Mental Ability tests
  • Are among the most useful predictors of performance across a wide variety of jobs
  • Are usually easy and inexpensive to administer
  • Use of ability tests can result in high levels of adverse impact
  • Physical ability tests can be costly to develop and administer

  • In general, job knowledge and work-sample tests have relatively high validity
  • Job knowledge tests are generally easy and inexpensive to administer
  • Work-sample tests usually result in less adverse impact than ability tests and written knowledge tests
  • Written job knowledge tests can result in adverse impact
  • Work-sample tests can be expensive to develop and administer

Biodata inventories
  • Easy and inexpensive to administer
  • Some validity evidence exists
  • May help to reduce adverse impact when used in conjunction with other tests and procedures
  • Privacy concerns may be an issue with some questions
  • Faking is a concern (information should be verified when possible)

Employment interviews
  • Structured interviews, based on job analyses, tend to be valid
  • May reduce adverse impact if used in conjunction with other tests
  • Unstructured interviews typically have poor validity
  • Skill of the interviewer is critical to the quality of interview (interviewer training can help)

Personality inventories
  • Usually do not result in adverse impact
  • Predictive validity evidence exists for some personality inventories in specific situations
  • May help to reduce adverse impact when used in conjunction with other tests and procedures
  • Easy and inexpensive to administer
  • Need to distinguish between clinical and employment-oriented personality inventories in terms of their purpose and use
  • Possibility of faking or providing socially desirable answers
  • Concern about invasion of privacy (use only as part of a broader assessment battery)

  • Usually do not result in adverse impact
  • Have been shown to be valid in some cases
  • Easy and inexpensive to administer
  • Strong concerns about invasion of privacy (use only as part of a broader assessment battery)
  • Possibility of faking or providing socially desirable answers
  • Test users may require special qualifications for administration and interpretation of test scores
  • Should not be used with current employees
  • Some states restrict use of honesty and integrity tests

Education and
experience requirements
  • Can be useful for certain technical, professional, and higher level jobs to guard against gross mismatch or incompetence
  • In some cases, it is difficult to demonstrate job relatedness and business necessity of education and experience requirements

Recommendations and reference checks
  • Can be used to verify information previously provided by applicants
  • Can serve as protection against potential negligent hiring lawsuits
  • May encourage applicants to provide more accurate information
  • Reports are almost always positive; they do not typically help differentiate between good workers and poor workers

Assessment centers
  • Good predictors of job and training performance, managerial potential, and leadership ability
  • Apply the whole-person approach to personnel assessment
  • Can be expensive to develop and administer
  • Specialized training required for assessors; their skill is essential to the quality of assessment centers

Medical examinations
  • Can help ensure a safe work environment when use is consistent with relevant federal, state, and local laws
  • Cannot be administered prior to making a job offer. Restrictions apply to administering to applicants post offer or to current employees.
  • There is a risk of violating applicable regulations (a written policy, consistent with all relevant laws, should be established to govern the entire medical testing program)

Drug and alcohol tests
  • Can help ensure a safe and favorable work environment when program is consistent with relevant federal, state, and local laws
  • An alcohol test is considered a medical exam and applicable law restricting medical examination in employment must be followed.
  • There is a risk of violating applicable regulations (a written policy, consistent with all relevant laws, should be established to govern the entire drug or alcohol testing program)

A document by the:

U.S. Department of Labor
Employment and Training Administration