Aptitude tests measure the ability to learn, while achievement tests measure what we have already learned. The main difference between aptitude tests and achievement tests is that aptitude tests discard previous formation, while achievement tests assess previous knowledge. Second, half of people with a particular IQ score on an IQ test will score higher than the predicted achievement score and half of them will score lower.
For instance, Frazier et al. The IQ-achievement discrepancy model is the traditional method used to determine whether a student has a learning disability and needs special education services. The discrepancy model is based on the concept of the normal curve click here for a review of the normal curve.
The requirement of normal perhaps defined as an IQ above 80 or average per- haps an IQ range of is included in the SLD views of many scholars e. Thursday, March 17, Achievement tests vs IQ tests. Different tests, test different things. Some are tests of achievement , while some are tests of potential.
These are two completely different things. Achievement tests measure current knowledge or skill development while tests of potential which include IQ tests of various sorts measure potential ability. Being a measure of skill development, achievement tests are directly influenced by what a child has learned to date. While ideally results of tests of potential will be reflected in the results of achievement testing, indicating a child is working at a level towards their potential, this is not always the case.
A difference between the results of tests of potential and achievement is considered to indicate underachievement. The greater the difference between the results, the greater the underachievement and need for further investigation to identify the cause.
Is one test better than another? It really depends on what you are measuring. If you are testing what a child has learned , then tests of achievement are needed. Standardised tests provide information about how the child and the class group compares to other populations of the same year level or age.
Each school has their own schedule of collecting information on student achievement levels. Achievement tests, also called standardized tests, measure student learning, usually once a year. The passage of the No Child Left Behind Act means all states must test student progress yearly in reading and mathematics. Achievement tests may be used to diagnose student strengths and weaknesses as well. While achievement tests are able to measure a student's progress at the end of the year, critics such as the Rand Corp.
There are state standardized achievement tests and national achievement tests. In addition, many high school students take the end-of-course tests in order to demonstrate knowledge before they can advance to the next course. Advanced Placement class students also take an end-of-course test to determine whether or not they will receive college credit.
Intelligence tests are different than achievement tests in that they measure someone's potential rather than progress. Intelligence tests can measure potential for academic achievement, or their strengths and weaknesses, according to Mind Disorders.
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