Three stages or phases of Harappan Civilization:
Early stage (3200 BCE - 2600 BCE): This is village phase of Harappan civilization. Major sites were Padri (Gujarat), Dholavira (Kutch), Harappa (Pakistan), Balakot, Amri and Bhirrana (Haryana), and Kot Diji.
Mature Stage (2600 B.C. – 1900 B.C.): This is urbanized phase of the civilization. Major cities were Harappa, Mohenjo-Daro, Lothal, Chahundaro, and Kalibangan.
Late Stage (1900 B.C. – 1300 B.C.): This is post-urban phase of the Harappan civilization. Here decline of civilization started. Major regions were Kudwala (Cholistan), Dwarka (Gujarat), Daimabad (Maharashtra).