1. Because leaders need to devise effective solutions in short time spans with limited information, they need to have cognitive abilities.
2. Trait appraisals are subject to validity problems due to evaluator bias.
Step-by-step explanation:
Cognitive abilities are knowledge based on the brain, which we need to perform from easy to complex tasks. They are mostly about how they read, recall, resolve issues and pay close attention than about any true knowledge. They were about how they think.
Traits have included the personality, behavior, leadership, work ethics, leadership skills, ethical sense, loyalty, flexibility, and judgment. On either hand, if the trait is legitly related to the work, then it might be valued.A trait is a person's own characteristic.