Differential Aptitude Test

a. Psychological Testing: Basic Concepts And Common Misconceptions:
Anne Anastasi reviews the basic concepts of psychological testing as well as recent developments in present-day psychological testing. She also acknowledges some of the more conventional misconceptions about testing, which Anne believes lead to the misuse of tests and to the misinterpretation of test scores. To demonstrate how sophisticated concepts and methodologies can be presented at a simple level, Anastasi discusses her own ways of teaching such topics as standard deviation, factor analysis, and item response theory. She explores major concepts relevant to test evaluation, test construction, and psychometrics. Anastasi next moves in for a closer look at item analysis

Differential Aptitude Test (D.A.T.s)
The Differential Aptitude Tests for Personnel and Career Assessment (DAT for PCA) are a series of assessments designed to measure an individual's ability to learn or to succeed in a number of different areas such as mechanical reasoning, verbal reasoning, numerical reasoning and space relations.
All of the DATs are timed, multiple-choice tests with time limits ranging from 20 to 30 minutes. These assessments can be used individually or administered as a battery of tests. DAT for Guidance assesses eight different types of ability, or aptitude, which are related to success in different areas of employment. Its co-standardized tests provide an eight point profile which portrays relative strengths and weaknesses in an individual's key aptitudes.
The eight abilities are:
• Verbal Reasoning: How well are you able understand ideas / concepts which are expressed in words? How clearly are you able to reason using words?
• Numerical Reasoning: How proficient are you in understand ideas expressed in number format? Are you able to apply reason / logic to

C. L. Taylor did this research to identify the factors that affect mathematical aptitude. Dr. Taylor considered various variables for the study, which are problem solving ability, interest in subject matter, differential abilities, IQ, success in Mathematics etc. Sample for research was 371 junior maths students of two public schools in Iowa. Finding of the research showed that high verbal ability, personality factors, reading ability, musical ability, interest in math, and socioeconomic data have all been shown to predict or correlate with math achievement. Also, factors of mathematical aptitude are: quantitative thinking, computational skills, interpretation of natural science reading materials, vocabulary, use of sources of information, general reasoning and logical thinking, knowledge of science, interpretation of social science concepts, and algebraic skills.
b. Genetics of Mathematical Aptitude
Author explains how variation in Mathematical aptitude is important for many aspects in life, especially for career in science and technology, engineering and mathematics. Also explained, however animals also have mathematical aptitude that has been identified by many experiments but complex mathematical aptitude is unique in human. Also investigation shows that mathematical aptitude test is inheritable and it is identified for mathematical learning disability and mathematical talent.
2.3. Intelligence Test