Caltrans TSI is responsible for conducting the California Household Travel Survey. This survey provides inputs for land-use modeling, trip generation modeling, and other transportation modeling and analysis. The results are very important for intelligent transportation planning and operations. The survey results are used by other agencies at the state level, as well as by MPOs and local agencies. Current survey practice uses paper and pencil diaries to obtain input from survey participants. This approach places an unnecessary burden on users, and increases the difficulty of the resulting compilation and analysis of data. The survey has become increasingly expensive to conduct, and paper diaries are particularly onerous for participants to use. The Mobile Survey Project represents an opportunity to address both survey costs and user burden.