This document discusses managed metadata and taxonomies in SharePoint 2010. It defines key terms like metadata, taxonomy, and folksonomy. It provides examples of how an organization's information architecture can evolve over time from simple document storage to a more complex taxonomy. Best practices are suggested for designing taxonomies, including considerations for dynamic external tags, security, open vs. closed term sets, and content type hubs. Programming the managed metadata service in SharePoint 2010 is also briefly covered.