An in-depth view of probably the single most important component of tourism, that of 'Tourism Demand' was discussed. These elements of demand were studied in detail. The focus was on techniques and principle methods but an empirical example was used to illustrate the methodology. Input-Output analysis as it relates to tourism in the Mexican economy was dealt with directly. Part of this section was devoted to bringing together and summarizing the suitability of using multiplier techniques for tourism research. In addition, attention was paid to the assumptions and limitations of Input-Output modeling. Input-Output methods and evidence, as applied to tourism in Mexico, were demonstrated in the final analysis.