Final answer:
David Wechsler devised the Wechsler Adult Intelligence Scale (WAIS), the Wechsler Intelligence Scale for Children (WISC), and the Wechsler Preschool and Primary Scale of Intelligence (WPPSI), which assess both verbal and nonverbal skills.
Step-by-step explanation:
The scale that David Wechsler devised, which tests both verbal and nonverbal skills, is known as the Wechsler Adult Intelligence Scale (WAIS) and its derivatives, including the Wechsler Intelligence Scale for Children (WISC-V) and the Wechsler Preschool and Primary Scale of Intelligence (WPPSI-IV). These scales are composed of a series of subtests that measure different aspects of intelligence, including verbal comprehension, visual spatial skills, fluid reasoning, working memory, and processing speed. They are some of the most widely used assessments in testing intelligence and cognitive abilities.