The SCOR metrics are organized in a hierarchical structure. SCOR describes level-1, level-2 and level-3 metrics. The relationships between these levels are diagnostic. Level-2 metrics serve as diagnostics for level-1 metrics. This means that by looking at the performances of the level-2 metrics I can explain performance gaps or improvements for level-1 metrics. This type of analysis of the performance of a supply chain is referred to as metric decomposition or root-causing. Similarly level-3 metrics serve as diagnostics for level-2 metrics. The level of a metric is included in the codification of the metric itself.