The Addiction Severity Index (ASI), used throughout the United States and other countries, is the most widely used assessment tool in the addictions field. It is a semi-structured assessment instrument designed for use with clients for substance abuse treatment. The ASI gathers information in seven important areas of a patient's life: medical, employment/support, drug and alcohol use, legal, family history, family/social relationships, and psychological problems. The ASI not only assesses drug and alcohol abuse, it also screens for problems in other areas, such as mental illness. Interviewer severity ratings indicate a client's unmet need for treatment. The ASI has been shown to be reliable and valid, but this applies only with "majority" populations. When substance abuse treatment directors at the North Dakota State Hospital realized that the cultural differences, background, and religious practices of Native Americans in their state (Chippewa and Sioux) were not being adequately addressed, the ASI, already required for use in North Dakota, was modified to address Native cultural issues. The modified instrument includes questions about spirituality, ceremonial practices and use of hallucinogens, tribal support for recovery, and culturally specific living conditions and lifestyle. Part 1 presents the fifth edition ASI in its original format and describes how it was modified for Native Americans in North Dakota. A clinical/training version, contained in Part 3, has instructions, hints, and space for comments. Part 2 contains the North Dakota State Adaptation for Use With Native Americans, which is similar in format to the clinical/training version, and a revised users guide. (Contains 16 references.) (TD)