Collaborative tagging of resources on the Web has become a commonplace occurrence. Web sites allowing resources to be tagged provide a tremendous amount of user-generated taxonomic information. However, information seekers are hindered by the lack of organization within these tags as well as the multitude of domains encompassed within these sites. To address these issues, we propose a multi-step approach for creating domain specific concept hierarchies from collaborative tags. Each concept hierarchy is based on domain specific subject matters, which may span more than one tag, as opposed to related work which are only concerned with the relationships between single tags.