Knowledge is only accessible if you know where to look for it; otherwise it will just remain buried somewhere. I have always found it irritating that there is a vast amount of information recorded in the 3 proceedings issued to date with their 240 or so papers but that they are not easily accessible. I am therefore very pleased that it has now been possible, in co-operation with the IRB-Verlag of the Fraunhofer Institute for Applied Research and the Technical Academy Esslingen to bring out a CD-ROM which contains the papers presented at this colloquium and the preceding colloquiums. The CD-ROM also includes more than 1,000 literature references registered by the IRB as well as a list of suppliers. My warmest thanks goes to all sponsors who have enabled this comprehensive and costly work to be issued.