Fluency and coherence are two different things but are grouped together because neither fluency nor coherence alone is considered as important as pronunciation，grammar or vocabulary. Fluency and coherence are both concerned with“the flow of language”— fluency concerns the physical flow of language while coherence concerns the logical“flow of interconnected ideas”。
You need to satisfy the requirements for both fluency and coherence to get a particular score for this combined item. In other words，if the examiner thinks you are a Band 6 for Fluency but only a Band 5 for Coherence，you will only get a sub-grade of Band 5 for the combined“Fluency and Coherence”。
For fluency，examiners notice three related things： continuity，speed and smoothness.
This refers to your ability to just “keep talking”，without too many unnatural pauses.（Natural pauses are the very short pauses that we make when we speak in order to show the completion of an idea； to think of the best word； to consider an answer to a question； or to give dramatic effect.）Long pauses are unnatural and usually result from the speaker searching for vocabulary or making a complete sentence in his head before speaking. Pauses at inappropriate places in your speech are also unnatural. Many candidates who have long，unnatural pauses in their speech often do this because they are checking their grammar before speaking. In other words，they are overly worried about making grammatical mistakes. Similarly，those candidates who translate from Chinese to English before speaking also speak with long pauses. In the test itself，you should concentrate more on letting your speech “flow out” rather than worrying too much about grammar. Yes，keep grammar in mind，but in the test you should rely more on the habits of correct grammar that you had practiced in your preparation before the test. You will get a better score this way.
If your speech is unnaturally slow，you will lose point for fluency. In the test，if you know that your pronunciation is fairly clear and accurate，you should push yourself to speak a little faster than you would in a normal，non-test conversation.
But if you know that your pronunciation is not so clear or accurate，DON'T push yourself to speak faster because that could cause the examiner to not understand your pronunciation at all！ You will lose big points if the examiner cannot understand you at all.
Smoothness is actually related to speed. If you don't use the two methods mentioned below to “smooth” your speech，it will be harder to speak at a natural speed. Two of the main ways to make your speech smoother are： a）to link your words and，b）to use contractions.
In natural spoken English，most words are not spoken as single words but are linked with the preceding and following words. If you try to say each word individually，it will not sound “smooth” and it will almost certainly be too slow. One of the main examples of linking is the pronunciation of words that begin with a vowel sound.