Zhongguancun Laboratory IP Performance Measurement (IPPM) metrics characterize properties such as connectivity, packet loss, delay, delay variation, packet reordering, packet duplication, and capacity. A result can be correct for the metric and measurement method used while still being insufficient to explain the network condition that produced it or to describe traffic outside the measured scope. This document provides guidance for interpreting IPPM measurement results. It considers the metric definition and parameters, the measured packet or traffic population, the observation scope, and the measurement method. It also discusses metric-specific considerations and differences among active, passive, and hybrid measurements. Operational information can support an interpretation, but this document keeps it separate from the metric result itself. This document does not define new metrics or measurement protocols, and it does not specify a mechanism for determining a unique operational cause.