This document summarizes Ray Land's presentation on threshold concepts and troublesome knowledge in relation to information literacy. The presentation discusses how librarians in the US are applying the concept of threshold concepts to the 6 frames identified in the ACRL Framework for Information Literacy. It also covers concepts like liminality, troublesome knowledge, and the underlying "games" or epistemologies of different disciplines that can make certain concepts difficult for students. Potential implications for redesigning courses to better support students in mastering threshold concepts are mentioned.