The book attempts to trace the origin and development of the discipline viz. "Psychology," emerged in European countries in the 19th century and tries to discuss briefly the world-famous Psychologists' divergent views on the newly appeared discipline. Aiming at analysing some of the excellent poems of Sangam classics from the psychological perspectives, especially in the framework of "Behavioural Psychology," the present research intends to interpret the appropriate feelings and behavioural patterns of dramatis personae: heroines and heroes, confidantes and companions, concubines and prostitutes, biological mothers and foster-mothers, and that of some historical characters: bards and minstrels, and chieftains and kings, evoked in akam and puram poems respectively.