Which of the following are guidelines for minimizing behavioral problems associated with implementing a new or significantly changed information system? (Check all that apply.) A. Control users' expectations by being realistic when describing the merits of the system B. Deal immediately with all emotional reactions to the change by explaining the logic behind change decisions C. Keep the system simple and, where possible, make the changes conform to existing organizational procedures D. Keep communication lines open to help those affected have an attitude of trust and cooperation. E. Implement system as soon as possible and have all users help test it