Purpose: Designed as a nonverbal test of performance intelligence.
Population: Ages 3 and over.
Scores: 2 scores, Test Age and qualitative or Q score.
Time: (15-60) minutes.
Author: Stanley D. Porteus.
Publisher: The Psychological Corporation.
Description: The Porteus Maze Test is a nonverbal test of performance intelligence. It is a graded set of paper forms on which the subject traces the way from a starting point to an exit; the subject must avoid blind alleys along the way. There are no time limits. The mazes vary in complexity from simple diamond shape for the average three-year-old to intricate labyrinths for adults. There are three sets of mazes: the original (the Vineland series), and two supplements, the Extension and the Supplement.
Scoring: Administration must be studied from Porteusí instructions. The scoring instructions are also included in Porteusí book. The scoring results in a Qualitative or Q score and a Test Age.
Reliability: This information is not included in the manual.
Validity: Many early studies of correlations with other intelligence tests ranged widely from moderate to high coefficients. Because the Porteus is a nonverbal performance test, one does not expect a high correlation with purely verbal tests, but the correlation should be at least moderately positive. Researchers note that a correlation coefficient of .50 is representative of studies with other IQ tests. Correlations with intelligence tests involving spatial abilities, such as the Kohs Blocks and Knox Cubes, are particularly high.
Norms: This information is not included in the manual.
Suggested Uses: Reviewers do not recommend this test for clinical
use, but suggest that further research is necessary to validate the authorís