This case study was designed for use in teacher-education courses for both graduate student laboratory assistants and lecturers or professors in natural sciences at the university or college level. The case demonstrates how laboratory practice and design can be improved to increase students' learning in the lab. First, participants use role play to discover how to interact with students in a lab setting to help students connect theoretical knowledge to their practical work. Second, participants re-design a cookbook lab exercise into an inquiry based lab. No specific knowledge of biology or chemistry is needed beyond high school level to complete the activity. Note: There is no answer key for this case study due to its unusual structure.