The VSProwess software was first released in 1990 as an in-field VSP processing system. Seismic data processing can be a challenging task, but thanks to its in-field heritage, VSProwess has a deserved reputation as an easy to use system. The clean and efficient design frees our team of VSP processors to concentrate on geophysical interpretation and allows us to easily extend our software capabilities to provide customer specific processing. VSProwess has been routinely used in most of the world's oilfields for many years. Hundreds of users have processed many thousands of VSP surveys using the software.