Which of the following is a requirement for individuals who undergo IOP?

Individuals who undergo Intensive Outpatient Programs (IOP) are required to attend treatment sessions on a daily basis. This structure is essential for providing the level of support and intervention needed to address substance use issues effectively. Daily attendance allows participants to engage in therapeutic activities, receive counseling, and develop coping strategies consistently, which helps to foster a supportive environment conducive to recovery.

In contrast, the other options do not accurately reflect the intensity or frequency required for IOP participation. While evaluations might occur periodically, they are typically more frequent than weekly to closely monitor a participant’s progress. Monthly meetings aren't sufficient for maintaining the engagement and therapeutic connection that characterizes an effective IOP, and follow-ups are generally necessary to ensure ongoing support and accountability after the program's completion. Therefore, daily attendance is a critical requirement that underpins the success of IOPs.