Methods for reviewing a collection of documents to identify relevant documents from the collection are provided. A search of the collection can be run based on query terms, to return a subset of responsive documents. A probability of relevancy can be determined for a document in the returned subset, and the document is removed from the subset if it does not reach a threshold probability of relevancy. Documents in a thread of a correspondence (for example, an e-mail) in the responsive documents subset can be added to the responsive documents subset. Further, an attachment to a document in the responsive documents subset can be added to the responsive documents subset. A statistical technique can be applied to determine whether remaining documents in the collection meet a predetermined acceptance level.