This report summarizes research and development (R&D) recommendations for the President's Commission on Critical Infrastructure Protection (PCCIP). These recommendations address the eight critical infrastructures' identified in Executive Order 13010 as well as crosscutting, interdependency issues that affect more than one infrastructure. The goal of the R&D recommendations is to provide a roadmap for the development of technologies that will counter threats and reduce vulnerabilities in those areas having the potential for causing "significant" national security, economic, and/or social impacts. Specific technologies considered are those that protect infrastructure and thereby reduce vulnerability; detect intrusions and provide warning; mitigate the effects of disruptions (incidents); assist in the response management of incidents; and facilitate recovery. Basic research requiring long-term government investment is emphasized. This research must be accompanied by technology development within the private sector Technology, broadly defined, includes processes, systems, models and simulations, hardware, and software. It is essential to have strong involvement from infrastructure owners and operators to ensure the development and acquisition of useful and usable products.