This document discusses how teachers navigate the complexity of their work through the development of schemas and heuristics over time and experience. It defines pedagogy as the interpenetration of complex systems like teaching, learning, curriculum and assessment. To reduce complexity in the classroom, teachers rely on heuristics or rules of thumb. The document argues that reflective practice and research help teachers identify shortcomings in their schemas and heuristics to better understand complexity and improve practice. Overall, it presents how teachers develop "pedagogical literacy" by continually refining their schemas and heuristics through experience and reflection.