Why do managers need Organizational Behavior knowledge?

FOR ACHIEVING ORGANIZATIONAL GOALS AND TARGATE WITH COMBINATION OF EACH AND EVERY EMPLOYEE ABILITY

Very good question and I will do my best to answer: 

:For several reasons

1-Customs and traditions 

2- The large experience which the manager have, and the new staff still the being, which need patience in training.

3- The work pressure, which let the managers sometimes forget the human element 

4-To remind the managers that, once he has a successful team, he will be the best manager and leader ever. 

1. Achieve team goals.

2. Achieve organzational goals and objectives.

3. Communicate with stakeholders.

4. Avoid conflict.