The best Teaching Methodology to teach a foreign language to ADULTS

Write about the best teaching methods and the worst teaching methods for adults. For instance, there were some of my study participants who preferred progressive methodology with group work and others who preferred traditional methodology with a lot of repetition and drilling. However, all participants wanted to learn a foreign language so that they communicate in the new country that they moved into and to integrate themselves into society. They also wanted that the content of the language lessons will be relevant to their lives and they preferred to learn how to speak the language than how to write it with regards to production. They also preferred translation to learn how to comprehend the native speakers. Do you think that you can compare and contrast sources who have written about teaching adults?