I've just finished the i-to-i 120-h online TEFL course. Here are my thoughts: PROS: Interesting and useful resources provided throughout the course. Platform is really user-friendly and easy to navigate around. Some useful quick and straightforward tips on how to teach English. Important concepts are reviewed and reinforced throughout the modules. CONS: I would have given more than three stars had it not been because of the course quizzes/tests. I found many of the questions in the quizzes/tests unclear, ambiguous or open to different interpretations. For example, in one of the tests we had to match the type of the class (General English, Business English, Academic English) with the type of writing activities (letter, email, report.) However, you didn’t specify what type of letter it was, business or informal. So when I matched 'letter' with 'General English', I got marked down because you said the answer was ‘Business English’. But you didn't tell me you meant BUSINESS letter, not a letter for a friend, which I thought it was, and which would mean the answer is General English. The same goes with ‘report’. I thought you meant a laboratory/research report, so I answered Academic English, but I got marked down because it turned out to be a business report, so Business English was the correct answer. But how could I have known if you just said ‘report’ or ‘letter’? Ambiguous. Moreover, in one of the tests I matched ‘Teacher talk time’ with ‘the time when the teacher speaks’ and got marked down. Well, teacher talk time IS when the teacher speaks. What else could it be? That’s what you said in the materials. The correct answer in the answer key turned out to be something completely irrelevant. So I guess you've got the correct answers mixed up in your answer key. CONCLUSION: Good course contents. Poor assessments.