Editing Holland Codes (section)

=== Prediger's two-dimensional model ===
Prediger constructed the scale of "work task" and "work relevant abilities" based on Holland's model, and carried out factor analysis and multidimensional scale analysis to clarify the basic structure.<ref>{{Cite journal|last=Prediger|first=Dale J|date=December 1982|title=Dimensions underlying Holland's hexagon: Missing link between interests and occupations?|journal=Journal of Vocational Behavior|volume=21|issue=3|pages=259–287|doi=10.1016/0001-8791(82)90036-7}}</ref><ref>{{Cite journal|last=Prediger|first=Dale|date=February 1996|title=Alternative Dimensions for the Tracey–Rounds Interest Sphere|journal=Journal of Vocational Behavior|volume=48|issue=1|pages=59–67|doi=10.1006/jvbe.1996.0005}}</ref><ref>{{Cite journal|last=Prediger|first=Dale J.|date=1999|title=Basic structure of work-relevant abilities.|journal=Journal of Counseling Psychology|volume=46|issue=2|pages=173–184|doi=10.1037/0022-0167.46.2.173|issn=0022-0167}}</ref> As a result, two axes of Data/Ideas and Things/People were extracted. Although Prediger's inquiry did not start from interest per se, it eventually led to the birth of models other than RIASEC, suggesting that the structure of occupational interest may provide a basic dimension.