Science and technology are embedded in every aspect of modern life. This executive summary describes how Public Engagement with Science (PES), in the context of informal science education (ISE), can provide opportunities for public awareness of and participation in science and technology. PES is an approach that has developed in the last 10 years within academic settings and the science policy arena. PES refers to seeking public input into policy decisions about the development and application of science and technology in society. The implementation of PES in the science policy arena has helped to develop and articulate new understanding of and expectations for the relationship between science and publics in policy making and other contexts. For example, in the last several years, ISE professionals have begun to explore how the principles of PES as practiced within the science policy arena might be adapted to the practice of ISE. This CAISE Inquiry Group Report seeks to serve as a prompt for discussion and exploration of PES in ISE, as opposed to being an authoritative sourcebook or how-to-manual. The authors' goals in writing this report are to open up the conversation up further, to foster dialogue and interaction across the communities, to intentionally build on one another's work, and to push the boundaries of what PES in ISE could mean as well as to improve its effectiveness and impact. The authors' also contend that there is a great advantage to viewing ISE as a spectrum of activities that spans two programatic models for involving the public in scientific ideas--one referred to as Public Understanding of Science and the one that is the focus of this paper, Public Engagement with Science. [For the full report, "Many Experts, Many Audiences: Public Engagement with Science and Informal Science Education," see ED536412.]