This paper offers a comprehensive understanding of the concept of Appropriate Technology (AT) and brings out its relevance today both from the standpoints of developing and developed countries. The paper also focuses on the evolution of AT movement in India and ideological contributions by various thinkers like M. K. Gandhi, E. F. Schumacher, and others to this movement. It also stresses that AT movement as a discursive one is not about mobilizing activities and people but is about academic discourses on AT. Lastly the paper presents three empirical case studies of AT promoting organizations emergent of the said movement that represent the original discourse and the later turning points of the discourse in the AT movement in India. Noteworthy, that these three case studies are analyzed from the vantage of the well known resource mobilization theory of social movements.