DSOs authorize RCL by completing an action in SEVIS called “Authorizing a Drop Below Full Course.” The DSO authorizes RCL for one term and may extend it, if needed, the following term if the student is still eligible. RCL allows F-1 and M-1 students to attend classes part-time. In addition, for illness or medical cases, a DSO may excuse a student from all classes for up to 12 months for an F-1 or five months for an M-1. During this time, they remain in F-1 and M-1 status. This document explains when a student may be allowed an RCL, how to authorize it, and how to modify an RCL in SEVIS.