How will the examiner score your Fluency and Coherence in IELTS speaking?

In the IELTS Speaking exam, the examiner will give you a score in 4 areas: Fluency and Coherence, Lexical Range, Grammatical Range and Accuracy, and Pronunciation. Your final score will be the average of these four scores rounded down. However, recently I realised that that there is a lot of confusion among students as to exactly what the examiner is looking for when they grade Fluency and Coherence. Fluency is relatively clear and easy to understand - that is your ability to speak without p...