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Recent experiments on pion correlations, interpreted as interferometricmeasurements of the collision zone, are compared with models that distinguish aprehadronic phase and a hadronic phase. The models include prehadroniclongitudinal expansion, conversion to hadrons in local kinetic equilibrium, andrescattering of the produced hadrons. We find that the longitudinal and outwardradii are surprisingly sensitive to the algorithm used for two-body collisions.The longitudinal radius measured in collisions of 200 GeV/u sulfur nuclei on aheavy target requires the existence of a prehadronic phase which converts tothe hadronic phase at densities around 0.8-1.0 GeV/fm$^3$. The transverse radiicannot be reproduced without introducing more complex dynamics into thetransverse expansion.Comment: RevTeX 3.0, 28 pages, 6 figures, not included, revised version, major  change is an additional discussion of the classical two-body collision  algorithm, a (compressed) postscript file of the complete paper including  figures can be obtained from Authors or via anonymous ftp at  ftp://ftp_int.phys.washington.edu/pub/herrmann/pisource.ps.

Source dimensions in ultrarelativistic heavy-ion collisions