Learning Tools Interoperability (LTI) is a standard developed by the IMS Global Learning Consortium (now 1EdTech) that allows seamless integration of third party applications into LMS platforms like Canvas and D2L.
Common Cartridge is a set of standards for moving course content between systems. A common cartridge is like an export of a structured set of digital learning objects which can be shared directly or uploaded into a learning object repository (LOR) inside an LMS. The LOR is like a marketplace or catalog where you can import various pieces of course content, of which commons cartridges are only one type. A commonplace example of a common cartridge would be the export of an entire course to use in a different system. Another example would happen earlier in the course design process for a core course where the same resources are used for different sections taught by different instructors. Here you might set up a weekly set of LMS modules (e.g., Week 1, Week 2, etc.), each with a chapter link from an ebook from the library which is being used as a text, from which the rest of the courses could be customized around and diverge from. The Common Cartridge is also an important method for collaboration between institutions with different LMS systems. Additionally, the course cartridge standard is a potential method for distributing OER.
Student Information System (SIS) loads connect and synchronize an institution's data across various enterprise software applications. Supporting course materials with reading list management software necessitates painstaking development and management of SIS loads with your university's IT department. Data from SIS loads is pulled from the university's Enterprise Resource Planner (ERP, e.g., Banner, PeopleSoft, Workday), which is the database of record, and used in target systems to load course information, student enrollment information, and directory/role information about users in your system.