Published Online: 30 JAN 2010
Copyright © 2010 John Wiley & Sons, Inc. All rights reserved.
Corsini Encyclopedia of Psychology
How to Cite
Coolidge, F. L. and Segal, D. L. 2010. Reliability. Corsini Encyclopedia of Psychology. 1–2.
- Published Online: 30 JAN 2010
Reliability refers to the consistency or stability of a measurement. A test with good reliability means that the respondent will obtain the same score upon repeated testing, as long as no other extraneous factors affect the score. In actuality, a respondent will rarely obtain exactly the same score over repeated testing, because repeated assessments of any phenomenon are likely to be affected by chance errors. Thus, the goal of testing is to minimize chance errors and maximize the reliability of the measurement, with the recognition that a perfectly reliable measure is rarely attainable.