| Summary: | The Wechsler Adult Intelligence Scale (WAIS) UGM Revision
has been long and widely used in Indonesia as an instrument for measuring IQ. Nevertheless so far it has
not much been done to improve the quality of it's items
and the test itself.
The purpose of this study was to examine the
quality of the WAIS Verbal Subscale, spesifically the Information and the Arithmetic Subtests by conducting
item analysis procedures, computing reliability
coefficients, and assessing the internal consistency
indexes of the subtests.
Based on a sample size of N = 100 (mostly were SLTA newly-graduates), for the Information subtest, it could be generally concluded that (a) difficulty-wise,
the items of the subtest were not orderly arranged. Some
i terns were so easy for the subjects. that they could be
considered inappropriate; (b) based on discriminating
power most items were proved to have very low validity
coefficients, and (c) the reliability of the subtest was
not convincing.
For the Arithmetic subtest, the general
conclusions were (a) the items were fairly well arranged
according to the item difficulty indexes. The variety of
item difficulty was good; (b) most items have reasonably
high validity coefficients, and (c) although the reliability coefficient of the subtest was much better
than one of the Information subtest it was still considered low.
Improvements of the quality of the items and the subtests are recommended.
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