IMPLAN (IMpact analysis for PLANning) is a computer-based, input-output model that calculates the total economic impact of a particular activity such as cultural tourism. It can also be used to estimate the dollar impact of changes in the level of an activity. IMPLAN generates region-specific multipliers that reflect the indirect and induced spending effects of cultural tourism. It does so by constructing a matrix that traces purchasing and spending between industrial sectors affected by cultural tourism within the region.