Balancing the need for intra and extratextual annotation with the sort of citation tree I covered in the last video, gives rise to a new set of infrastructural problems that can only be resolved with the additional organizational power of a knowledgebase. In this video I will compare Evernote, Mendeley, Zotero and Citavi and explore their ability to resolve these problems, focusing on Citavi and its unique ability to generate microthematic metadata.