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20th century.
22
This thinking began to change as questions arose about the impact of the
particular situation or the followers’ attitudes on the leader’s behavior and

performance. It became apparent that a person doesn't become an effective
leader just because he or she has certain traits. Research into these and
other issues led to the birth of additional leadership theories in the 1950s
and 1960s. One key idea that led to new thinking about leadership was
behavioral theory. Although having certain traits may predispose

individuals to certain behaviors, behaviors appeared to be the more
important predictor of leadership effectiveness.
23
Figure 1: Leadership Theory Transitions

22 http://www.businessballs.com/leadership-theories.htm#leadership-introduction.
23 http://www.bretlsimmons.com/2011-04/leadership-traits-and-behaviors-four-evidence-based-
suggestions/.

David Kolzow 20