The National Emissions Data System (NEDS) was designed by the Environmental Protection Agency to be a central repository for all emissions inventory data. Since the inception of NEDS, the major concern of EPA has been the accumulation of an acceptable data base. After the Oregon state inventory data were converted to NEDS format, the NEDS inventory and the Oregon inventory did not correlate. This report describes the development and implementation of a computer program which could read the Oregon data files and convert the data present to a format acceptable for input to the NEDS system. The methodology used to develop this program is presented. Much of the data required some degree of conversion. A discussion is included of each of three tables used by the program to convert the data which could not be used directly. The purpose of each program is described and a system flow chart is illustrated. This program gives the state the capability of producing their inventory in NEDS format to meet any requirements from EPA.