Which concept refers to the reliability of results over repeated testing?

The concept that refers specifically to the reliability of results over repeated testing is reliability. In the context of research, reliability indicates the degree to which an assessment tool produces stable and consistent results. When a study can yield similar results upon repeated testing, it demonstrates high reliability.

For example, if a survey measuring social attitudes produces the same results when administered multiple times under the same conditions, this showcases the reliability of that instrument. Researchers prioritize reliability because consistent results across various trials strengthen the credibility of their findings and ensure that any observed effect is not due to random chance.

Other concepts such as validity, operationalisation, and representativeness are important in research but focus on different aspects. Validity assesses whether a study accurately measures what it claims to measure, operationalisation relates to defining variables in measurable terms, and representativeness deals with how well a sample reflects the larger population.