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This study aims to evaluate a community-based social marketing (CBSM) campaign for promoting sustainable consumption behavior (SCB) among Thai youth. As a result, the "3S Project" was a CBSM campaign innovation to promote SCB among Thai youth which was created and piloted with a small segment of university students. The project was evaluated using quasi-experimental research in the form of a non-equivalent control group, designed for checking the effectiveness. Multivariate analysis of variance (MANOVA) at .05 statistically significant level was employed in this analysis. After intervention, it found that the "3S Project" innovation was effective. The mean scores of the experimental group were higher than the mean scores of the control group significantly in all five indicators, including the attitude towards behavior, the subjective norm, the perceived behavioral control, the intention to perform SCB, and sustainable consumption behavior (SCB). These results were recognized as new findings in the field of social marketing communication. They extend the existing body of knowledge in this field of study because using CBSM for sustainable behavior change in Thailand is still considered as being in its initial stage. Therefore, the results of this research project will be strongly beneficial for social marketing practitioners, communication campaign planners, and any organizations related to promote SCB among youth on all levels (international level, national level, and even local level) in utilizing this CBSM campaign innovation for promoting SCB among the Thai youth, both effectively and efficiently.

This study aims to validate the effectiveness indicators of social marketing communication campaigns for reducing health-risk behaviors among Thai youth by using a quantitative research with 1,000 undergraduate students aged 18-24 years old in Thailand. A secondorder confirmatory factor analysis was used to check compliance with empirical data at the .05 significance level. The findings showed that the effectiveness indicators of social marketing communication campaigns for reducing health-risk behaviors among Thai youth consist of forty-nine indicators from eight core components: 1) attitude toward health-risk behaviors reduction, 2) subjective norms, 3) perceived behavioral control, 4) intention to reduce health-risk behaviors, 5) practices for reducing health-risk behaviors, 6) knowledge in dangers and impacts of health-risk behaviors, 7) campaign brand equity, and 8) communication networks. These new developed effectiveness indicators should be taken into evaluating the effectiveness of social marketing communication campaigns for reducing health-risk behaviors among youtheffectively and efficiently for a sustained success both in Thailand and in international level.