Introductory courses are designed for prospective teachers who want to experience teaching before making the decision to train formally and obtain qualifications. The courses usually last from a week up to four weeks. These are not certificate courses and you will not be regarded as a qualified teacher after completion of your Introductory course. You will, however, be able to say that you have had some experience of English language teaching. Some schools require trainee teachers to take an introductory course before starting a Certificate course.