Materials development is an important part of teacher education programs and language learning. Traditionally, teacher education focused on transmitting theoretical knowledge with little practical experience, leaving a gap between what teachers knew and what they could do. Currently, programs take a competency-based approach that balances theoretical and practical knowledge. Participating in materials development can increase teachers' awareness, creativity, and self-reflection by providing concrete experiences to link theory and practice. It is also important for researchers, applied linguists, and practicing teachers as a way to stimulate innovation and professional development. Materials development should be a compulsory part of language teacher preparation.