The objective of the study was to develop a test which could measure both the qualitative and quantitative aspects of drug-using behavior, including such factors as attitudes toward drugs, experience with drugs, and knowledge about drugs. The Drug Use Scale was developed containing 134 items and dealing with five classes of drugs: marijuana, hallucinogens, stimulants, depressants, and opiates. Study subjects were male and female college students. Results of the assessment showed a positive relationship between attitudes, experience, and knowledge subtests. Drug users obtained higher knowledge scores than did nonusers, and showed more positive attitudes toward drugs. The study concludes that the Drug Use Scale is reliable. (Author/EK)