The TEFL trainer should be an industry expert, and to become an expert in this domain, the individual must take additional qualifications, which are as follows DELTA - (Diploma in the English Language for Teaching Adults) This course is provided by Cambridge English. This course is advanced, and the candidate must have completed basic TEFL training. This course covers the topic in detail to give the required exposure.  DIP TESOL This course is provided by Trinity College of London. This course is also an advanced level training which will help to become a TEFL Trainer. Certificate In Teaching Business English and Young learners This course helps in gaining specialization in one area. These courses are for a few weeks and days. This course is useful for positions like Teacher and coordinator.