Fig. 3
From: Trash Taxonomy Tool: harmonizing classification systems used to describe trash in environments
A Tree diagram of materials hierarchy list displaying all hierarchical relationships among material words. At the far left of the tree is the most general classification and at the terminal end of each branch is the most specific classification. For example, soft plastic is a terminal end of the hierarchy in the materials hierarchy and a subclass of plastic. B A subset of the tree diagram of items hierarchy list. The entire hierarchy can be seen online at openanalysis.org/trashtaxonomy. At the far left of the tree is the most general classification and at the terminal end of each branch is the most specific classification. For example, cups, food trays, food wrappers, and drink containers are a higher classification order, while wine bottle is a more specific subclass. Arrows pointing right have additional subclasses and can be expanded