Three necessary and sufficient conditions that must be satisfied if traits should be unique determinants of the Leadership Index are
1.The trail quality should follow a descending order as one traverse from the highest to the lowest levels.
2. There must be a high correlation between the level of traits and the level of success.
3. The achievement trait curve should be convex to the trait axis as one travels from the low to the high trait terminals.
The above conditions have been suggested by