A psychometric test or psychological assessment is essentially an objective and standardised measure of a sample of behaviour.  Taking a test is like taking a sampleIf you would like to know about the different types of psychometric assessments there are please click here read more about types of psychometric tests

  • Like many other tests in science, psychological tests are trying to sample a small but important and carefully chosen sample of behaviour.
  • This psychometric test sample can then be used to predict a broad and significant area of behaviour. 
  • As an analogy, in the case of a scientific blood test there is a small sample of blood taken and tested. 
  • The test results then are used to predict the blood profile in all of the body, not just the sample. 
  • Similarly, in psychological testing a small sample of behaviours are measured in the assessment, and this is then used to predict likely behaviours in other situations. 

Psychometric Tests & Assessments are Objective and Standardised

There are two things all psychometric tests and psychological assessments have in common.  These are Standardisation and Objective Measurement. The following outlines what is involved in test standardisation and ensuring an assessment is objective:



This means there is uniformity (or standardisation) of the testing procedure in its administration, marking and interpretation. This ensures:

  • Administration conditions are in the same conditions by trained administrators – Read more about test administration...test administration
  • The tests is marked in a standardised way – each person is compared to the same scoring key and marking guidelines.Administration and interpretation needs to be standardised
  • The scores from two people are comparable as the testing conditions and test items are the same for all those who take the test. 
  • The interpretation is standardised for the same scores on assessments.

Norms and Comparison to Others

The use of norms is another aspect of standardisation – read more about our norms…read more about norms

  • The number correct on an ability test is meaningless unless we know how it compares to others who take the test. 
  • We need to know what is “normal” or the average performance on the test, and this is where norms come in. 
  • Comparing scores to norms allows us to standardise the interpretation to how a person’s result compare to an appropriate norm group’s average.

Objective Measurement

Psychometric tests are objective in that they should be independent of subjective judgement of the administrator or interpreter of the data. Objective measurement

  • This means that theoretically any one individual should obtain the identical score on a test, regardless of who administers, marks, and interprets the results.
  • As humans we all have biases, likes and dislikes, which can affect how objective we can be in most situations. 
  • However, psychometric tests endeavour to reduce the subjectivity and bias, by adhering to standard interpretations of scores which are objectively measured.

Robust Psychometric assessments also have gone through significant scientific research and need to meet the reliability and validity standards of test construction.  Read more about reliability and validity…reliability and validity

We provide psychometric tests as a service to our clients but we are not a test supplier or distributor. We do not sell tests directly as such, but provide a full service of administration, scoring and reporting of psychological tests and assessments.

Click here to download a pdf of this psychological assessment page

Read more about the following Psychometric Assessment Topics:

NZ Psychological Society
SIOP - Society for Industrial & Organizational Psychology
ITC - International
Testing Commision
NZAPT - NZ Association for Psychological Type
APA - American Psychological Association

































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