GeoStudio Add-Ins can be used in place of any internal GeoStudio function (such as those under the Define menu) or a SIGMA/W material model. The Add-Ins listed below are ready to use—just install them with the Add-In Software Development Kit and restart GeoStudio. You can also write your own using the resources provided in the Add-In Software Development Kit.

• Non-Darcian Flow Material Model for SEEP/W
• Radiative Heat Transfer Material Model for TEMP/W
• Gas Consumption and Exothermic Reaction Boundary Condition for TEMP/W and CTRAN/W
• Hypoplastic Sand Material Model for SIGMA/W
• Saturated-Unsaturated SHANSEP Material Model for SLOPE/W
• Hypoplastic Clay Material Model for SIGMA/W

GeoStudio can be used with PEST for parameter estimation problems. See the example file for instructions on how to use PEST with GeoStudio.