The abstraction hierarchy is one of the core foundations of the ecological interface design principle. It consists of a tree-like diagram and is used for describing a specific work domain. The diagram is structured in a top down perspective whereas each level describes various elements in that specific work domain. This top down approach is used during the entire process of identifying the hierarchy, so you start by describing the purposes of the design and then you work your way down to the more technical details and their parts. The structure of the hierarchy consists of five levels namely, the functional-, the abstract-, the generalized- and the physical function; and finally the physical form.
Below is a picture showing the final result of the description of our work domain, or in other words, our Abstraction Hierarchy.
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