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All of the literacy programmes featured in this publication offer valuable experiences and lessons on how the challenges posed by linguistic and cultural diversity can be productively addressed by harnessing the potential of language and culture as enriching resources in the process of literacy teaching and learning. A major lesson that has emerged over the years is that the use of local languages as the medium of instruction enhances the effectiveness and efficiency of the learning process in developing literacy, numeracy and (second or more) language skills. However, mother tongue-based literacy not only facilitates the learning process, but is also an important symbol of identity, unity and self-determination. It is closely intertwined with culture and local values, wisdom, worldviews and tradition. A number of the featured programmes demonstrate that language and culture in education are highly political. Respect for all languages and cultures, and their equal treatment, can play a critical role in fostering national cohesion. In some cases, this is contributing to rebuilding peace in post-conflict communities. Literacy programmes that contribute to the preservation of linguistic and cultural diversity should, also, be viewed as integral to sustainable development.