Two evaluative instruments useful for DWI (Driving While Intoxicated) Programs were developed. The Drinking and Driving Knowledge Inventory was developed using the current literature in the area to formulate the test specification. The Drinking and Driving Opinion Survey, an attitude scale, was developed using equalappearing- interval scaling. The instruments can measure change in level of DWI information and DWI attitude.

The instruments were standardized and first applied to a DWI rehabilitation course in Phoenix, Arizona;​ they are now used routinely in numerous programs throughout the country. Their usefulness as preliminary evaluative measures and as a supplement to follow-up record studies for determining the effectiveness of selected DWI programs has been demonstrated.

Practical evaluative designs that can appropriately be applied using the instruments are presented.