Initial discussions concerning core-based methods for determining in situ stress magnitude and orientation were held in the summer of 1995 between Sandia National Laboratories (SNLA), represented by John Lorenz and David Holcomb, and Union Pacific Resources Corporation (UPRC), represented by Lee Krystinik. These discussions led to an effort to apply Anelastic Strain Recovery (ASR) to core retrieved from the Stratos well in late September, 1995. The ASR results were essentially null, probably because of the time required to retrieve core from 16,000 feet. Other approaches to determining stress orientation can be applied to "old" core using measurements of the anisotropy of elastic wave speeds and anisotropic, non-linear strains exhibited by core subjected to hydrostatic stress. Stress magnitudes have been estimated using Differential Strain Curve Analysis (DSCA) and Differential Wave Velocity Analysis (DWVA), both of which rely on determining the pressure required to close the relaxation cracks.