Probably few organizations value self-motivation like the U.S. Marine Corps, so when their recruits began showing deficiencies, officers dug into the latest psychologist research. What they found is that one’s “locus of control” greatly determines the extent of self-motivation: do you believe you are firmly in control of your destiny or that external events determine your life? Individuals whose locus of control is internal, i.e. they believe they control their own destiny, have a greater impulse toward taking action. New York Times reporter Charles Duhigg explains how the Marines took this data to better train their recruits.