Ah, good old cohesion and coherence, what better way could the EL examiners use to drain the lives of us poor EL students...
Firstly coherence, which is all about how well the audience understands the text. Does the text rely on inference (background knowledge) for it to be understandable? Does the text have a logical beginning, middle and end? Are there subheadings which organise the information provided (and if there are, does the paragraph that follows the subheading actually relate to that subheading?) Does the text use a standard variety of English (which is generally more widely understood than non standard varieties)?
Secondly cohesion, which is about how well different aspects of the text tie in together (i.e how well the text flows). Cohesion is present in a text if it displays one or more of the following features:
Pronoun substitution (in order to repeat unnecessary repetition), deictic ties (links to time and place), coordination and subordination (compound and complex sentences respectively, which allow for ideas to flow), repetition (that has a purpose behind it), collocation (ideas that go together ie. green and grass), parallelism (similar syntactic structures, such as listing).
I believe that's most of it, but if anyone else thinks of something that I've forgotten, feel free to add

Hope this helps!
