Citizens are often required to make decisions about socioscientific issues in a climate characterized by conflict within both the scientific community and the larger society. Central to the process of decisionmaking is a critical examination of the relevant scientific knowledge involved. Individuals capable of performing this task can be considered scientifically literate in a decisionmaking sense. In this article we explore two ways of critically examining scientific knowledge in the context of a current socioscientific dispute: NASA's Galileo Mission to Jupiter. The two approaches we outline, termed the positivist and social constructivist positions, are examined in terms of their inherent views concerning the nature of scientific knowledge, in particular their use of constitutive and contextual values when evaluating knowledge claims. Because the social constructivist position acknowledges the importance of contextual values, it provides citizens with accessible standards for evaluating scientific knowledge claims. The positivist position, on the other hand, relies on constitutive values which we show are normally inaccessible to ordinary citizens. The positivist position, however, is most closely associated with the predominant social issues approach to science-technology-society (STS) education. Implications for STS education of adopting the social constructivist position as the basis of scientific literacy for decisionmaking are explored. (C) 1994 John Wiley & Sons, Inc.
