Physics from Z0 measurements: mass, width, and total cross section

This is an interim report on the activities of Working Group 1. The aim of this group is to enable as accurate a measurement as possible of the mass, width and total peak cross section of the Z0 resonance to be made by the Mark II group at the SLC. Why we wish to do this is discussed in sections 2, how we can do it in sections 3 and 4. Section 3 deals with experimental limitations and sets the scale for how well we wish to control the theoretical uncertainties reviewed in section 4. Finally section 5 summarizes the problems to be resolved and our expectations