After a telephone call, the interviewer selects a result (Complete, No Answer, Busy and so on). They can make an appointment to call someone back at a specific date and time and can leave comments about call attempts. You can restrict which interviewers can handle certain types of calls, based either on the results of previous call attempts or on prior information you have about respondents. You can also determine results automatically, based on answers to survey questions. You can schedule calls by time zones.