This research project investigated a method to promote one low-fat, high-fiber choice in a national chain fast-food restaurant. It is an extension of efforts toward large-scale dietary change. A procedural extension of a prompting strategy was used in an attempt to influence customers to choose a salad. A simple visual and print message based on themes derived from formative and pilot research at the restaurant was presented during two intervention phases of a reversal design. The message, "Be Fit and Healthy; Eat a Low-fat SALAD as Your Meal or Add a Side Salad," was displayed in colorful posters and tent cards which were placed on all the tables. Data from a comparison base in a neighboring town were obtained. A one-month follow-up phase was included in the design. Prices and in-store advertisements were identical in both locations. The existing computerized cash register system was used to obtain accurate, objective data. Daily and weekly sales percentages of several entrees were obtained. Results of analysis using a correction procedure indicate that when graphically represented, salad sales across phases increased with the introduction of the prompts, and decreased with their removal. In addition, three entrees not represented by associated prompts remained stable across phases. For Salads-combined, results indicate that sales increased about 15% and 9%, respectively, for the first and second intervention phases. Daily temperature during this project was variable. Although a comparison site was used to control for the effects of weather, results indicate that salad prompting may have increased sales more during warmer temperature. Population demographics were recorded. Analyses of the customer population during this project indicate customers were about equal by gender, and consisted primarily of white, 18-39 years old individuals. The cost for each added salad bought during the intervention was about $.22, and the cost to raise the percent of salad sales, each percent, across the four weeks was about $16.00. Future research should attempt to foster longer term behavior change and integrate multifaceted promotions. / Master of Science