Table 1 Example of lumping analysis for SMC material classes with the NOAA material classes. Both data cards are first joined to the materials alias relational table, then to the hierarchical table. The final result can be plotted to show how a joined survey list could be lumped. The tree structure under Hierarchical Classes is tabbed to show finer levels of granularity in the descriptions. Count is the number of objects of that material type that the surveys observed. Total Sum is how those sums would lump given the hierarchy. The class Missing is the number of classes that were not integrated into the TTT. Zero indicates an accurate merge

From: Trash Taxonomy Tool: harmonizing classification systems used to describe trash in environments