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Over the past decade, the rapid advances and growth in deployment of service-based systems, such as the booming cloud computing systems, have had major impacts on the economy, society, and our daily lives. Today, users have grown more accustomed to accessing various online services from a wide range of computing devices, from smart phones/tablets to desktop PCs, for both business and entertainments. However, such a trend also means that more users' private and confidential information than ever is transferred processed and stored in service-based systems. This trend raises serious concerns on the trustworthiness of such systems. Substantial research has been devoted to developing new security mechanisms, network protocols, and methods to improve the trustworthiness of service-based systems. Human factors, however, have not been sufficiently addressed in the development of trustworthy service-based systems.