Factors That Make Psychometric Tests Reliable [Infographic]

What is the value of a psychometric test if the data provided in it is not reliable. Psychometric assessments are created with the sole purpose of measuring an individual’s mental capabilities, behavioural style, and to measure whether they are suited to carry out a role according to the required personality characteristics and intellectual abilities.

Hence, reliability is critical for the success of psychometric tests. After all, what is the point of having the same test yield different results, for the same person each time. This is especially true if scores can affect employee selection, retention and promotion. For instance, a particular test that measures intelligence should give the same results, every time an individual attempts it.

There are always minor conflicts in test reliability because different people taking the same psychometric test may have contrasting thoughts, feelings, or ideas at different times, thus leading to a variance in scores. A lot of factors, like stable traits and momentary issues, can both lead to variance in test scores.

There are a number of factors that influence test reliability. Some of these factors are the timing between two test sessions that affect the test-retest and alternate/parallel forms of reliability. Additionally, similarity of content and expectations of subjects in context to different testing elements affects only the latter type of reliability along with split half and internal consistency.

Organizations need to consider changes that candidates undergo over time while assessing reliability of psychometric tests, like their environment, physical state, emotional, and mental well-being. also need to be considered. Test based factors such as inadequate testing instructions, biased scoring lacking in objectivity, and guessing on the part of the test-taker also influences the reliability of tests.

So, do your psychometric tests measure what they are supposed to? So, just how reliable is your test? Here is an infographic that illustrates it all.


Mettl, is one of India’s largest, fastest growing assessment and skill measurement company. The company’s new case study simulator aims to bring case study methodology to online assessments. Testers can simply log on to the Mettl platform and participate in the treasure hunt, better described as the gamification of a business case problem, upon invitation from a participating company or institution.

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