Mechanical Reasoning (MR) measures how well a person can understand mechanical principles and devices and the laws of physics. This ability is especially important in courses in industrial arts and occupations in Technology and Science.

Spatial Relations (SR) measures how well a person can visualize or think in three dimensions and can mentally picture the position of objects from a diagram or picture. This ability is important in courses in arts and industrial arts and jobs in Science, Technology, and Arts.

Verbal Reasoning (VR) measures how well a person can reason with words and has the facility for understanding and using concepts expressed in words. This ability is important in general academic success and in jobs requiring written or oral communication, especially those Professional level occupations in Communication, Science, Business and Service involving high levels of responsibility and decision-making.

Numerical Ability (NA) measures how well a person can reason with and use numbers and work with quantitative materials and ideas. This ability is important in school courses and jobs in the fields of Science, Service and Technology involving mathematics, chemistry, physics, or engineering and in the Business and Clerical fields.

Language Usage (LU) measures how well a person can recognize and use correct grammar, punctuation, and capitalization. This ability is especially important in jobs requiring written or oral communication and in Clerical jobs as well as Professional level occupations in Science, and in all levels of Business and Service.

Word Knowledge (WK) measures how well a person can understand the meaning and precise use of words. This is important in Communication and all Professional level occupations involving high levels of responsibility and decision-making.

Perceptual Speed and Accuracy (PSA) measures how well a person can perceive small details rapidly and accurately within a mass of letters, numbers and symbols. This ability is important in Clerical office work, and other jobs requiring fine visual discrimination.

Manual Speed and Dexterity (MSD) measures how well a person can make rapid and accurate movements with their hands. This ability is important in Arts, Skilled and Technology, Skilled occupations and other jobs requiring use of the hands.