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The Wechsler Adult Intelligence Scale (WAIS) is designed to provide a comprehensive assessment of adult intelligence and includes both verbal and performance subtests. This structure allows it to measure a range of cognitive abilities, including verbal comprehension, perceptual reasoning, working memory, and processing speed. By including both types of subtests, the WAIS can give insights not only into verbal capabilities but also into non-verbal and practical problem-solving skills.

The focus on both verbal and performance aspects is an advantage, as it recognizes that intelligence is multifaceted and not limited to just verbal reasoning abilities. This dual approach facilitates a more holistic evaluation of an individual's cognitive strengths and weaknesses, making it particularly useful for various psychological assessments and interventions.

In contrast, the other statements do not accurately describe the WAIS. It is not solely focused on verbal reasoning, nor is it designed specifically for children, as it targets adult populations. Additionally, the WAIS has demonstrated a high level of reliability and validity, comparable to other standardized intelligence tests, making it a trusted tool in psychological evaluation.