Trait Theory

After reading Northouse (2010) it seems to me that Trait theory is a great first start at trying to figure out what makes a great leader, because with all the research that has been done, the following characteristics have stood out in great leaders:

The Big Five:
1) Extraversion - how assertive and positive a person is with others
2) Conscientiousness (Dependability) - how fast one makes decisions, is organized and detail oriented and can be depended on.
3) Openess - how curious one is, and creative, informed and insightful.
4) Neuroticism (Low is better) - how depressed & anxious a person is.
5) *Had a weak link to leadership --Agreeableness - how much on conforms, trusts and accepts others as well as nurturing them.

Mann (1959):
Extraversion
Dominance
Adjustment
Intelligence
Masculinity.

Stogdill, 1974:
1. How motivated one is to get tasks done
2. Goals/persistence
3. Solve problems creatively
4. Initiative (social)
5. Self-esteem = high
6. Accept responsibility for actions
7. Stress is taken
8. Tolerates things not going their way
9. Is influencial
10. Can take the purpose & tie it into planning the situation.

Main Traits:
Intelligence: Can speak, perceive and reason well and can learn and apply info to life.
Self-confidence
Determination - loyal, keep your word
Integrity - people trust you, you live by principles, not giving up, people believe them and trust them too.

Another important trait:
Emotional intelligence - knowing how to handle emotions and solve problems and communicate.

Kirkpatrick & Locke (1991):
Task knowledge
Cognitive AbilityConfidence
Integrity
Motivation
Drive

Strengths of this approach is that if gives people a place to start in terms of where they can try to improve, however weaknesses are many such as how about the other factors that play into effect when looking at effective leaders such as how their leadership impacts the followers and their productivity? And why haven't they been able to create one solid list of characteristics?
"People who possess certain traits in one situation may not be leaders in another" (p. 26, Northouse, 2010)