The 100 or more years of research on traits was completed originally to to distinguish between traits and behaviors to define the five major traits associated with leadership to distinguish between traits and skills determine a universal set of traits associated with leadership

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I believe the answer is  Determine a universal set of traits associated with leadership
The original purpose of the research is to help society finding the perfect people whose characteristic would be suiotable for leadership on all field.
As it turned out, there is no universal sets for leadership because on general, different situations would call for different form of leaderships.
(for example, harsh and  strict leadership would be suitable for military but wouldn't be usable in artist community)