Interpretation in both national and state parks provides more than mere entertainment to the visitor. Interpretation has been proven to be an effective deterrent to littering, vandalism and the deterioration of natural park resources. The focus of this research is to determine whether high quality programs, a large number of programs, and/or a diversity of programs offered by Indiana state parks attract a higher percentage of the total number of visitors entering a park facility to an interpretative event.The subjects need in this research were the state parks of Indiana. Data was obtained from a weekly form (SP-48) used by the Indiana parks. SP-48 forms from 1987 through 1990, Memorial Day through Labor Day weekend, were used: the total number of programs incorporated into this study was 20,595. The parks were divided into categories (all parks, year-round parks, and seasonal parks) and groups (high, medium and low number of facilities) to provide a similar statistical grouping for analysis.The factors studied were paired and regression analysis were performed on each pairing. Correlation coefficients indicated that an increase in the quantity of programs offered was highly correlated (p<001) to an increase in the percent of gate entrants participating in an interpretive event. Presentation diversity was significantly related to either of the above variables. / Department of Natural Resources