A symposium on research performed using the TOUGH family of numerical codes was held on 15–17 May 2006 at the Lawrence Berkeley National Laboratory in California. This special issue of the Vadose Zone Journal contains revised and expanded versions of a selected set of papers presented at this symposium (TOUGH Symposium 2006; http://esd.lbl.gov/TOUGHsymposium), all of which focus on multiphase flow, including flow in the vadose zone.

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