Practicing Data-driven Learning as a vocabulary learning has been used as a vocabulary learning facilitator technique in Iranian high schools the students have been evaluated before and another one after applying the mentioned technique and their related conclusions have been analyzed.This book recommends the teachers of English as a foreign language emphasize the application of DDL(Data-driven Learning) approach for learning vocabulary. It is the responsibility of the language teachers to make use of the authentic natural and relaxed as possible and they should make their students aware of the advantages of different language learning strategies especially data-driven-learning and context-based ones.