There are two aspects of discovery when thinking about documents: reviewing the documents and reviewing to understand the contents of the documents. When you are the party receiving documents, then your document review efforts are more concerned with understanding those documents. Your job is that of investigator charged with the task of understanding what opposing counsel has delivered to you. Whereas the document reviewer is focused on the responsive, the investigator is trying to separate the outcome determinative, from the merely helpful or the barely responsive. Presumably the documents your strategy will hinge upon is a faint signal submerged in a sea of white-noise.