It has been widely recognized that the "new physics" results from a high energy collider are related to the detector capabilities, and that future detec­ tors must solve the problems presented by the new environment. Vertex detectors, in particular, will have to sustain enormous rates, have a great resistance to radiation damage, while retaining good spatial accuracy. Promising technologies are emerging, and gaseous detectors are improving: this workshop was intended as a point of reference towards future detectors, with particular emphasis on experimental results achieved so far. We wish to thank the Ettore Majorana Center for the splendid hospitality in Erice; and the secretaries of the conference, R. Nania and G. Anzivino for their hard work in collecting and organizing these proceedings. F. Villa Stanford Linear Accelerator Center Stanford University v CONTENTS Tracking at 1 Te V A. Seiden ..... 1 B Physics at PEP and SLC A. Seiden ........ . 19 The MARK II Vertex Detectors: Status and Prospects J. Jaros 37 The Mark-J Vertex Detector H. Anderhub et al., presented by M. Bourquin 71 A Modified Time Expansion Chamber as a Vertex Detector et al., presented by C. Del Papa . . . . . . . . . 95 G. Bari Operation of Multidrift Tubes with Dimethyl Ether R. BoucHer et al., Presented by F. SauH . . ...... 101 Results From the MACI Vertex Chamber H. N. Nelson . . . . . . . . . . . ........... . 115 Wire Chamber Aging and Wire Material M. Atac ............. .