Footnote 15 One component of being a good coach - being able to support, scaffold, expand, or unpack the culturally specific ways with words that students bring - is domain-specific knowledge. The I-Club tasks are designed to be sites for teacher learning, so that teachers, as they plan for and enact the tasks, will themselves be scaffolded into a deeper understanding of physics. In short, the teacher does not have to know everything there is to know about physics, but is her/himself positioned as a learner (an Investigator). The I-Club practice is an apprenticeship for both students and teachers; it does not require that either students or teachers begin with the skills that the practice is designed to develop. This program puts "identity" in the place of pre-requisite cultural or linguistic strengths - and makes taking on the identity of an investigator a natural part of the practice.