To ensure advance case reading when teaching with case studies, establish clear expectations from the outset and provide guiding questions to focus students' preparation. 

Implement pre-class assignments such as brief memos or online quizzes to encourage thorough reading. Use a combination of cold calls and warm calls during discussions to motivate preparation, and incorporate small group work at the beginning of class to allow students to refine their thoughts. Choose relevant and engaging cases that resonate with students' interests, and distribute materials well in advance to allow adequate preparation time. 

By creating a classroom culture that values thorough case preparation, you'll foster more productive and engaging discussions, ultimately enhancing the learning experience for all students.