1998/1999 Development of ADT version 2.0
- Chose ADT topics based on prior diagnostics by Phil Sadler and Mike Zeilik.
- Validated based on ~60 interviews,
- open-ended in Fall 1998,
- with distractors in Spring 1999.
Analyzed 2500+ multiple-choice answers
- Statistics, e.g., Spring 1999 Discrimination range 0.32–0.67 (of –1.00 to +1.00).
- Rewrote ADT version 1.0 using psychometric rules.
- Studied 30 student written responses to open-ended questions.