Reliability, which is the consistency of test scores or ratings, is one of several ways to assess the quality of a measure. Three major types of reliability, including brief descriptions, are:

  • Interrater reliability refers to the consistency of the ratings made by two or more observers on the behavior (e.g., classroom behavior) of one or more students.
  • Internal consistency reliability (e.g., split-half reliability, parallel forms reliability, and coefficient alpha) refers to the degree of uniformity of the item content of a measure. In other words, the degree to which the items on a measure are similar in content to each other. To evaluate the internal consistency reliability, a single administration of the measure is given and then the degree of homogeneity of the item content of the ...
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