Reliability

From LiteracyTentWiki

Reliability AleAssessment

How accurately a score will be reproduced if an individual is measured again. The degree to which the results of an assessment are dependable and consistently measure particular student knowledge and/or skills. Reliability is an indication of the consistency of scores across raters, over time, or across different tasks or items that measure the same thing. Thus, reliability may be expressed as:

(a) the relationship between test items intended to measure the same skill or knowledge (item reliability);

(b) the relationship between two administrations of the same test to the same student or students (test/retest reliability);

(c) the degree of agreement between two or more raters (inter-rater reliability).

An unreliable assessment cannot be valid. (see also Validity)

Back to Assessment Glossary

Back to ALEGlossary