China Mobile (Hangzhou) Information Technology Co., Ltd Telefonica I+D Swisscom Huawei Huawei Ciena A network incident refers to an unexpected interruption of a network service, degradation of a network service quality, or sub-health of a network service. Different data sources including alarms, metrics and other anomaly information can be aggregated into few amount of network incidents by data correlation analysis and the service impact analysis. This document defines YANG Modules for the network incident lifecycle management. The YANG modules are meant to provide a standard way to report, diagnose, and resolve network incidents for the sake of network service health and root cause analysis.