This article is intended for licensed IDI Qualified Administrators. If you are not a licensed IDI Qualified Administrator and are interested in being licensed to use the Intercultural Development Inventory, visit this article: Should I become an IDI Qualified Administrator (QA)?
Intercultural Development Inventory (IDI) scores are “normed,” meaning they are converted to a graphic scale that ranges from 55 to 145 with a standard deviation of 15 points (the same as intelligence measures). So, Denial ranges from a score of 55 (or less) to 70 (15 points), polarization from 70-85, etc. By norming IDI Perceived Orientation (PO) and Developmental Orientation (DO) scores, this allows comparisons of individual or group PO and DO scores to a “normative population”. This is the same as SAT scores, for example. The chart in Appendix C on page 121 of the most recent IDI Resource Guide gives information on this. For instance, a DO score of 109 is in the 25th percentile, meaning 75% of people taking the IDI would score lower than 109.
It is possible for a PO or DO score to be lower than 55 and higher than 145. When this happens it simply means that as a normative score, their PO or DO score is reflective of less than 1% of the population. In other words, a score less than 55 is not different than one of 55 (all less than 1% of the population; all in low Denial). The same goes for scores above 145.
The score range for each Orientation is as follows:
Denial: 69.99 or below
Adaptation: 130 or higher