This document discusses issues related to materials used in English language teaching (ELT). It notes that commercial materials play a central role in most language instruction worldwide. While many publications on materials focus on design and development, the field remains under-researched. Course books in particular are still ubiquitous globally, though they have disadvantages like not meeting local needs and contexts. The document also discusses debates around global versus local materials, how teachers adapt to curriculum changes, and the impact of technology on ELT materials.