Community psychology's intervention-oriented approach guided by a personenvironment fit perspective is a productive way to address the study and mitigation of social impacts. The most obvious intervention to prevent human problems that accompany large scale projects is to stop the project itself. However, if the decision is made to implement the project, interventions can be designed to develop human competencies and resources in the community in an effort to prepare residents for the coming change. Important tasks for a community psychologist could include the collection and dissemination o f valid information concerning potential social and psychological problems resulting from the project, the development and evaluation o f interventions designed to prevent or ameliorate these problems, and to be an advocate for community residents.Social impact assessment (SIA), a multidisciplinary area of social science concerned with estimating, appraising, and mitigating the social and psychological effects of large-scale planned change, offers social scientists a vehicle to engage in prevention and intervention across a broad range of human concerns. Wolf (1974, 1976) states that the primary goal of a social impact study is to assess whether to implement a proposed project based on social and psychological effects. McCoy (1975) suggests further that if the project is approved, social scientists can help develop a mitigation plan designed to minimize the undesirable effects and enhance the development of human 'All correspondence should be sent to Gregory J. Meissen,