"Preparing for Tomorrow's World" (PTW) is an interdisciplinary, future-oriented program incorporating information from the sciences/social sciences and addressing societal concerns which interface science/technology/society. The program promotes responsible citizenry with increased abilities in critical thinking, problem-solving, social/ethical reasoning, and decision-making. The socio-scientific reasoning model (SSRM) is the theoretical basis of the program. The model consists of four interacting components: (1) logical reasoning development based on Piagetian theory; (2) moral/ethical reasoning based on Kohlberg's stages; (3) Selman's views of social role taking stages; and (4) a content or informational component. SSRM serves as the basis for identifying the types of learning experience and the sophistication level of those experiences important to help students develop. A major instructional strategy related to SSRM is the dilemma discussion. Dilemmas, brief stories in which conflicting moral/ethical issues must be resolved, consist of six stages: background information, presentation of dilemma, selection of alternative positions, small group discussions, class discussion, and discussion summary/closing. Each of these steps is discussed, followed by some general guidelines for stimulating dilemma discussions and characteristics of any dilemma discussion. In addition, a list of helpful hints and answers to commonly asked questions (such as how long should a discussion be continued) are provided. (JN)