A phenomenological prediction of the creep behavior of cross-linked polymers undergoing simultaneous physical relaxation and chemical network scission is presented. The fundamental assumption underlying this calculation is defined and its physical significance is discussed. The predicted response is related to the behavior of nonreacting polymers through a time-adjustment parameter. The magnitude and time dependence of this parameter depend on both the physical relaxation characteristics and the kinetics of the scission reaction. In the limit of totally elastic systems, a description of the well-known chemorheological behavior ensues.