These research summaries give a snapshot of many of the research efforts within the Ptolemy Project. These summaries appear in the collection of research abstracts EECS/ERL 1998 Research Summary. The research summary is published once a year by the Industrial Liaison Program, Electrical Engineering and Computer Sciences Department, and the Electronics Research Laboratory of the University of California at Berkeley. The Industrial Liaison Program office can be reached at +1-510-643-6691 or ilp at eecs berkeley edu