Students attending ADTD courses are generally unavailable to their office during classroom hours. Students will not be called out of the class for telephone messages unless the message is dealing with a personal or family emergency. Messages will be taken for all other incoming calls and posted on a bulletin board. Students may return calls during breaks between classroom presentation and after class has ended for the day. Calls which are to be returned during break periods should be sufficiently short to allow students to return to the classroom before class resumes. This is necessary to ensure that each student receives the maximum benefit from the training and other students are not distracted by late arrivals.