The construction of social psychological service system means applying psychological theories, methods and techniques to social governance. Social governance usually is a process of multi-subject co-governance, in which all stakeholders make a group decision based on negotiation. However, it is difficult to systematically evaluate the quality of group decision-making. Therefore, a "process-result model" of group decision-making was proposed, in which the quality of group decision-making is evaluated on the levels of “process” and “result”. Concretely, there are two types of processes of “information processing” and “interpersonal interaction”, and two types of results including “objective decision results” and “subjective feeling”. Based on the model, a video evaluation method and a self-assessment questionnaire to measure the quality of group decision-making were developed and applied among college students and urban community residents. It was found that the self-assessment questionnaire of group decision-making was a valid instrument. Moreover, the results from the video evaluation method and the self-assessment questionnaire could confirm each other, which suggests that these two methods can be generalized into more settings of social governance.
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