This paper reports on surface fatigue testing. The goal was to develop models for predicting wear. As part of this goal@ the study reports on developing an understanding of the stresses and wear predictors using FZG tests. Since the focus was on micropitting@ the first tests used the method described in FVA Information Sheet No. 54/I-IV. Later@ the procedure was modified to account for higher contact stress levels that are predicted for the heavily crowned and tip relieved AGMA test gears that were manufactured as a part of the AGMA tribology test program. This paper provides extensive analysis that includes detailed topography measurements of the tooth profiles@ predictions of contact stresses and contact patterns. It discusses factors that affect contact stresses@ flash temperatures@ and test film thickness.