Third World Science (TWS) materials were developed to add a multicultural element to the existing science curriculum of 11-16-year-old students. TWS attempts to develop an appreciation of the: (1) boundless fascination of the natural world; (2) knowledge, skills, and expertise possessed by ordinary men and women everywhere; (3) application of knowledge, skills, and expertise to the solution of practical problems; (4) impact of modern technology; (5) importance of language in the interpretation and communication of knowledge and ideas; and (6) the influence of the cultural background in the perception of knowledge, problems, and solutions. Provided are discussions of the project's background, development, content and teaching methods, aims and objectives, future development, and availability. Units/topics produced as of July 1982 (or in advanced preparation) include: carrying loads on heads; cement; charcoal; clay pots; dental care; diet and nutrition; food preservation; fuels; housing; iron smelting; methane digestors; natural dyes; natural fibers; plants and medicines; salt; soap; and vegetable oils. The use of the salt unit in a London (England) school with a significant proportion of immigrant students is briefly described. (JN)