The goal of this capstone was to revise the Drama and Theater taxonomy in Resources for College Libraries to make it more equitable in its classification and consistent in its structure. Revisions were informed by targeted readings about controlled vocabulary development, and domain research from The Essential Theater by Oscar G. Brockett. I was able to update the taxonomy to make it more equitable and consistent by using these resources and feedback from my sponsor. These changes will make the taxonomy easier to keep current going forward and easier for librarians to use for collection development.