This document discusses how Zotero can be used for embedded librarianship and instructional assessment. Zotero allows librarians to have longer-term contact with students through embedding in courses. It also provides low-cost ways to assess what students are learning from instruction sessions by analyzing their use of sources over time. The document presents a case study where a librarian used a shared Zotero group library and tools within Zotero like the timeline to evaluate how well students were able to select a wide range of appropriate sources and understand the iterative nature of research. Student feedback indicated that collaboration and communication through Zotero was helpful but that privacy options also need to be clear.