The concept of participation in sustainable urban development practices is actually more and more popular in Europe and all over the world. In parallel, there is a rapid growth of urban design and planning projects including local communities in urban development planning activities. According to such concepts, this chapter, starting from the description of the results of field and desk researches carried out by ‘La Sapienza' University of Rome and related to communities involvement strategies currently available in Europe, describes and analyses a case study based on a concrete application of theoretical and methodological approaches, and two more cases of possible application of an integrated methodology. All the projects described concern the city of Rome.