Interpretation
Reliability
0.90 and above
Excellent reliability at the level of the best standardized tests
0.80 - 0.90
Very good for a classroom test
0.70 - 0.80
Good for a classroom test; in the range of most. Few items which could be improved.
0.60 - 0.70
Somewhat low. Needs to be supplemented by other measures to determine grades. There are probably some items which could be improved.
0.50 - 0.60
Suggests need for revision of test, unless it is quite short. The test definitely needs to be supplemented by other measures for grading.
0.50 or below
Questionable reliability. This test should not contribute heavily to the course grade, and it needs revision.
Reliability
0.90 and above
Excellent reliability at the level of the best standardized tests
0.80 - 0.90
Very good for a classroom test
0.70 - 0.80
Good for a classroom test; in the range of most. Few items which could be improved.
0.60 - 0.70
Somewhat low. Needs to be supplemented by other measures to determine grades. There are probably some items which could be improved.
0.50 - 0.60
Suggests need for revision of test, unless it is quite short. The test definitely needs to be supplemented by other measures for grading.
0.50 or below
Questionable reliability. This test should not contribute heavily to the course grade, and it needs revision.
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