ABSTRACT Community-based surveillance (CBS) is a development program of integrated surveillance. Unfortunately, the CBS program's implementation has not been optimal. Most of the CBS cadres do not carry out their duties properly. This study aims to improve the skills of CBS cadres through interpersonal communication and module development. This study was a quasi-experimental research with a non-randomized pre-test post-test control group design. This study's population was 48 cadres of CBS who were not active in several sub-districts. Those were mainly in Tanete Riaja Sub-district, Barru Sub-district, Balusu Sub-district, and Mallusetasi Sub-district. The intervention sample was 20 people in the Tanete Riaja Sub-district. The control sample was 20 people scattered in the Barru Sub-district, Balusu Sub-district, and Mallusetasi Sub-district obtained by purposive sampling. Data analysis used a paired T-test, Wilcoxon test, unpaired T-test, Mann Whitney test, and chi-square test. The results showed differences in knowledge (0.000) and attitudes (0.000) before and after the interpersonal communication intervention and module development. There was a difference in attitude (0.000) between the intervention group and the control group. No difference was found in knowledge between the intervention group and the control group. The study concluded an increase in Community Based Surveillance (CBS) cadres' knowledge and attitudes after conducting interpersonal communication and module development. It is suggested that the next study should conduct interpersonal communication training for health workers and CBS cadres.