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NNAT2 ® -  Naglieri Nonverbal Ability Test

The Naglieri Nonverbal Ability Test (NNAT) assess general reasoning ability in children. Like all nonverbal ability tests, the NNAT is intended to assess cognitive ability independently of linguistic and cultural background.
Area of Testing:
         1. Pattern Completion:
                       Ability to recognize pattern and identify the missing portion
         2. Reasoning by Analogy:
                       Ability to recognize relationships between several geometric shapes
         3. Serial Reasoning:
                       Ability to recognize the sequence of shapes
         4. Spatial Visualization:
                       Ability to recognize how two or more objects would look if combined

On the NNAT, often students "don't understand what they're supposed to do," said David Lohman, a professor of educational psychology at the University of Iowa. Therefore, it is very important for students to learn what to do when tackling these kind of abstract questions.
OLSAT8® - Otis-Lennon School Ability Test
The Otis-Lennon School Ability Test (OLSAT®) is a measure of abstract thinking and reasoning ability of children pre-K to 18. 
Area of Testing:
         1. Verbal Comprehension:
                       Measures the ability to manipulate or respond to information through listening, i.e. following directions
         2. Verbal Reasoning:
                       Measures the ability to discover patterns or relationships and to solve problems through the use of language,
                       i.e.aural reasoning & arithmetic reasoning