Use of these adaptations requires an examiner or experienced professional who is fluent in the examinee's language. This was an important development as it attempted to overcome biases that were caused by "language, culture, and education. The similarities subtest requires test takers to indicate the similarities between pairs of things. A common purpose for the WAIS is for educational planning and placement with older adolescents and adults. Also read article about Wechsler adult intelligence scale from Wikipedia.
The point scale concept significantly changed the way testing was done by assigning credits or points to each item. In addition, prior data analysis results have indicated that these items are equally difficult when either numbers or letters are given first.