THE NATIONAL MATERIALS PROPERTY DATA NETWORK, INCORPORATED OR MPD NETWORK, IS A NOT-FOR-PROFIT SERVICE FOR THE INTERNATIONAL ENGINEERING AND MATERIAL SCIENCE COMMUNITIES WITH THE MISSION OF PROVIDING SINGLE-POINT ON-LINE ACCESS TO RELIABLE PERFORMANCE DATA FOR MATERIALS AND FOR JOINTS IN THOSE MATERIALS. THE PRODUCTION MPD NETWORK SYSTEM WILL OPERATE ON STN INTERNATIONAL, THE WORLDWIDE SCIENTIFIC AND TECHNICAL INFORMATION NETWORK, BEGINNING IN LATE 1990. THIS UPDATE INCLUDES BACKGROUND MATERIAL ON THE TYPES OF DATA AND DATABASES BEING INCLUDED IN THE MPO NETWORK AND ON THE INTERFACE WHICH MAKES THE SYSTEM USEFUL TO ENGINEERS AND SCIENTISTS.