GSD did not display sufficient empirical evidence to validate the instrument's scores or to confirm Gregorc's theoretical interpretation of four learning style channels or two bipolar dimensions. Supporting evidence, learning style models generally A report from the UK think-tank Demos reported that the evidence for a variety of learning style models is "highly variable", that "authors are not by any means always frank about the evidence for their work, and secondary sources ... may ignore the question of evidence altogether, leaving the impression that there is no problem here." Major works Gregorc Style Delineator - A psychometric test An Adult's Guide to Style, Gabriel Systems, Maynard (1982). Mind Styles FAQs Book The Mind Styles Model: Theory, Principles and Practice See also Learning styles Footnotes References Anthony F. Gregorc. Gregorc Style Delineator: Development, Technical, and Administration Manual. Gregorc Associates, Inc., 1984. Timothy J. Sewall. "The measurement of learning style: a critique of four assessment tools". Technical report (ERIC ED267247), Wisconsin University, Green Bay, Assessment Center, 1986. 21st-century American psychologists Living people Educational psychologists Intelligence researchers Miami University alumni Kent State University alumni Year of birth missing (living people)