The dotLRN-Catalog package make use of various packages like acs-content-repository, categories, assessment dotLRN. It makes use of acs-content-repository API to create the data-table and store the data in the database. It is designed to provide professors a way to create courses that can have different versions (revisions) and than can be associated to dotLRN classes and communities, categorized in different categories, and also associate one assessment that will provide a way to the users to register to the system, enroll to different dotlrn classes, make member of communities, etc.