If a researcher gives a personality test to several individuals and the gives them the same tests a few weeks later, she is most likely testing reliability
Psychological measurement can be defined as a tool specifically designed to quantify latent psychological variables. There are at least two main quality indicators for psychological measurement: reliability and validity.
To elaborate, given the information, it can be concluded that the researcher tries to assess the temporal reliability (also known as the test-retest reliability) of the personality test. Other types of reliability are inter-rater reliability and internal reliability.
Reliability is defined as the probability that a product, system, or service will perform its intended function adequately for a specified period of time, or will operate in a defined environment without failure.
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