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For a test to be reliable, it also needs to be valid. For example, if your scale is off by 5 lbs, it reads your weight every day with an excess of 5lbs. The scale is reliable because it consistently reports the same weight every day, but it is not valid because it adds 5lbs to your true weight.

Relationship Between Reliability and Validity For a measurement to be valid, it has to be reliable. While validity is associated with accuracy, reliability is all about consistency. Therefore, an unreliable measurement cannot be valid. However, a measurement can be reliable without being valid.

Validity will tell you how good a test is for a particular situation; reliability will tell you how trustworthy a score on that test will be. You cannot draw valid conclusions from a test score unless you are sure that the test is reliable.

Psychological assessment may come in two forms: formal and informal. Formal assessment involves the use of tools such as tests, questionnaires, checklists and rating scales, while in informal assessment the interview/evaluation usually lacks such structure or organization.

A simple example of validity and reliability is an alarm clock that rings at 7:00 each morning, but is set for 6:30. It is very reliable (it consistently rings the same time each day), but is not valid (it is not ringing at the desired time).

What is the difference between reliability and validity in psychology? Reliability is an examination of how consistent and stable the results of an assessment are. Validity refers to how well a test actually measures what it was created to measure.

When used in reference to individual assessment instruments or to types of tests, the phrases “psychometric soundness” and/or “psychometric adequacy” refer to whether the tests demonstrate sufficient levels of reliability and validity for ethical use with clients.