Reliability and Measurement Error

Start with measurement and consistency

A mind map on measures used in psychology introduces self-report, observable behavior and physiological measures. It also lists ways to describe behavior, including frequency, duration and accuracy. This is a useful starting point for thinking about what a measure captures before looking at how consistently it works.

The flashcards on measurement reliability introduce observed scores, true scores, random error and systematic error. Use them to become familiar with the terms, then return to the measurement map and consider which terms you can connect.

Explore types of reliability

The “Reliability” flashcards cover internal and external reliability alongside split-half, test-retest and inter-rater approaches. A separate mind map describes test-retest reliability in terms of applying the same test to the same people at different times under the same conditions.

Another mind map brings together test-retest, alternate forms and internal consistency, as well as coefficient alpha and the Spearman-Brown formula. Comparing the map with the flashcards can help you organize the approaches and practice telling them apart.

Check your understanding

The Reynolds quiz includes a question about interpreting a reliability coefficient and another about methods used with different kinds of test item scores. Work through the relevant flashcards or mind map first, then use the quiz to check how well you can apply the terms.

If a question is difficult, return to the related resource and look for the distinction it asks about. The flashcards on research skills also list reliability, coefficient alpha, item analysis and several types of scale.

Place the topic in the unit

Reliability and Measurement Error is a section of Measurement, Validity and Reliability in Research methods and academic skills. The measurement reliability flashcards list validity alongside reliability, while a mind map compares accuracy with reliability. Together, they offer starting points for relating this topic to the wider unit.

Try the quiz, then build your own mind map or flashcards to organize the terms.