An important form of impact assessment focuses on cities, or communities or neighbourhoods, or sometimes on minorities like immigrants or indigenous people. At the citywide level these impact assessments may make use of the quantitative, computer-assisted regional multiplier programs described in the previous chapter. At the more local level they are usually quantitative and qualitative case studies, examining economic, social, political and cultural change. At this level too there is an important movement afoot for study area residents to assist, oversee, and sometimes undertake and control the impact assessment process.