The introduction to the just discussed case studies drew attention to their diversities; this analysis will focus on the insights to be gained by a close study of their commonalties and underlying principles. Starting from a consideration of the why, or the motivation (reasons) with which each agency entered the scene, it will go on to examine the how, or the manner of functioning of each, as well as the what, when and where, or the programme content. It will also discuss by whom, or the role of the workers-the key players in the projects-and the participation of the community. Costs and quality, the nature of finances, the question of sustainability, and the impact of the programmes or with what and so what will be some of the issues reviewed to gain insights, before summarising the lessons to be learnt from these studies.