Achievement Test - A test designed to measure the knowledge or proficiency of an individual in something that has been learned or taught, as arithmetic or typing. (Webster's Encyclopedic Unabridged Dictionary)

AERA - American Educational Research Association http://www.aera.net/

APA - American Psychological Association http://www.apa.org

Chronological Age - the number of years a person has lived, esp. when used as a standard against which to measure behavior, intelligence, etc. (Webster's Encyclopedic Unabridged Dictionary)

Genius - 1. An exceptional natural capacity of intellect, especially as shown in creative and original work in science, art music, etc. 2. A person having such capacity. 3. A person having an extraordinarily high intelligence rating on a psychological test, as an IQ above 140. (Webster's Encyclopedic Unabridged Dictionary)

Intelligence Quotient (IQ) - An intelligence test score that is obtained by dividing mental age, which reflects the age-graded level of performance as derived from population norms, by chronological age and multiplying by 100: a score of 100 thus indicates a performance at exactly the norm level for that age group. (Webster's Encyclopedic Unabridged Dictionary)

Mean - (Math) A quantity having a value intermediate between the values of other quantities; an average. Something that is midway between two extremes. (Webster's Encyclopedic Unabridged Dictionary)

Mental Age - The level of native mental ability or capacity of an individual, usually as determined by an intelligence test, in relation to the chronological age of the average individual at this level. (Webster's Encyclopedic Unabridged Dictionary)

NCME - National Council on Measurement in Education http://www.ncme.org

Normal Curve - (statistics) A bell-shaped curve showing a particular distribution of probability over the values of a random variable. (Webster's Encyclopedic Unabridged Dictionary)

Standard Deviation - (statistics) A measure of dispersion in a frequency distribution, equal to the square root of the mean of the squares of the deviations from the arithmetic mean of the distribution. (Webster's Encyclopedic Unabridged Dictionary)

Stanford-Binet - One of the most standard and widely used IQ tests.

Statistics - The science that deals with the collection, classification, analysis, and interpretation of numerical facts or data, and that, by use of mathematical theories of probability, imposes order and regularity on aggregates of more or less disparate elements. (Webster's Encyclopedic Unabridged Dictionary)

Validity - The state or quality of being valid. 2. legal soundness or force. (Webster's Encyclopedic Unabridged Dictionary)