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Many engineering components in engines and machines are of a counter conformal geometry (e.g. valve trains, rolling element bearings and gears) and impose not only high shear rates and temperatures but also extremely high pressures on the lubricant. The effect of pressure is to elastically deform the sliding/rolling contact geometry. Of crucial importance to the engineering and lubricant designer is the magnitude of the lubricant film thickness generated under these severe conditions. Steady state isothermal elastohydrodynamic (EHD) lubrication is now relatively well understood by the use of engineering correlations, first propounded by Dowson et. al., for both line and point contacts, which are used as design tools. However, with ever increasing demands to improve the efficiency of machines, these correlations do not satisfy all the design needs, especially under reversal conditions, where wear is a major problem.