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Educational standards such as common core state standards for math http://www.corestandards.org/Math/ can be visualized as a hierarchical graph structure. The common core math standards use a structure of:
Subject (Math) > Domains > Clusters > Standards.
From a top level graph "node" representing the "math" subject there are second level nodes that represent domains, e.g. "Counting and Cardinality" or "Number and Operations in Base Ten". Domains are further structured into clusters and clusters contain node instances that represent an individual standard.
Any given cluster or standard can be related to others in other subjects and domains. We want to create a unique data visualization that will allow each of these different types of data categories to be explored and expanded, so that teachers and students alike can better explore educational standards.