This document contains the full texts of plenary lectures presented at a conference which focused on developments in integrated science education (ISE), between 1968 and 1978, and on issues and new trends in science education in the 1980s and 1990s. These lectures include: (1) "Interaction of Science and Society" (J. C. Terlouw); (2) "A Review of Integrated Science Education Worldwide" (Sheila Haggis and Philip Adey); (3) "The Case for Teaching Science as a Unity" (Victor Showalter); (4) "Reflections on the Implementation of Integrated Science Teaching" (F. James Rutherford); (5) "Environment as an Integrating Factor in Science Education" (Rais Ahmed); (6) "Where Have We Got To? Where Are We Going?" (Judith Reay); and (7) "Where Have We Got To And Where Are We Going?" (Charles Taylor). Also included are summaries of 10 conference working groups. These groups concentrated on: the aims and objectives of ISE; design and content of ISE courses; education of teachers for integrated science; strategies and implementation of ISE; evaluation of ISE; resources for ISE; integrated science and environmental education, nutrition, health, and technical education; relationship of ISE to other subjects in the curriculum; national and international problems in disseminating and implementing ISE; and science and society. (JN)