In the IELTS Speaking test part 3, you will need to give your opinion and talk at length about a particular topic. This part of IELTS is not formal and you can talk in a casual conversational way. The marking criteria is assessing you on your grammar, pronunciation, vocabulary and fluency. The questions in part 3 are linked to Part 2 of the Speaking test. This part of the speaking test lasts for about 5 minutes.