Abstract : This report presents the results of a preliminary study of techniques, which will aid in reducing the ability of a signatory of a peaceful nuclear explosion (PNE) treaty to use a PNE for illegal purposes, e.g., the testing of nuclear weapons or testing the vulnerability of military systems to nuclear weapons effects. The scope of the study includes investigation of both technical means and appropriate treaty provisions. Ideally, a combination of monitoring techniques, e.g., seismic, EMP, and infrared would be combined with selected treaty provisions to provide maximum assurance that covert testing was not being conducted. Theoretical studies involve the development of individual technologies as well as the most effective methods for combining them. In this effort, emphasis has been placed on investigating the feasibility of an electromagnetic pulse (EMP) monitoring system. Such a system may be useful, when used in conjunction with a seismic system, for detecting explosions hidden among one or more declared peaceful explosions.