3.It has been said that most systems fail because systems builders ignore organizational behavior problems. Why might this be so?

The advantage of administering personality tests on employees is that it will allow the employer to know the mindset and personality of the employee. this will allow the employer to at least have an idea as to how the employee works and how his attitude in the workplace. the disadvantage is that it may make the employee a little anxious as to whether he would meet the personality requirements of the employer and whether he would be able to retain the job or not. 

General education? that is the only one i could think of.

Wite quickly without over thinking .