Sentence Fluency focuses on the type, fluidity, and effect of sentences within the essay. Strong sentence fluency leads to natural, active, and concise writing.

Fluency: 
Fluency is the ability to expertly deliver information quickly, naturally, and correctly.

Concision:
Concision is marked by effective and efficient communication: it is free of superfluous information and requires a strong command of language and a dedication to revision.