Reviews historical background of the Lisu, covering population, physical aspects and costumes, language, and living conditions. Gives characteristics of the Lisu, noting appearance, health and sanitation experience, nature and attitude. Discusses social structure in terms of family and marriage, kinship, property, birth and death, and social status. Discusses Lisu tradition and prohibition, religion and rites. Focuses on Lisu economy, considering husbandry, crop cultivation, trading system, opium cultivation, and problem of land use. Deals with administration, judgement and communications. Considers hill tribes problems. Includes policies of the Public Welfare Development on Hill Tribes in Thailand. [TAIC]