Her thesis presents the leading facts in the history of Mindanao during the period 1521-1665 as well as the social, economic, political and religious conditions that existed among the inhabitants of the island. Discussion on culture is done in accordance with so-called cultural patterns of human living. With a typification of the culture of the Filipino Muslims being predominant in the area. A greater understanding of the people of Mindanao, particularly the Muslims, would have made the tribes more friendly and less a menace as they were thought to be. More progress would have occurred in Mindanao and not lagging behind causing the current problems.