The Cambridge Dictionary defines "reasonableness" as "the fact of being based on or using good judgment and therefore being fair and practical." For litigants in the discovery phase of litigation, being "fair and practical" may have different connotations and can be quite subjective. Can both plaintiffs and defendants—opposing parties in an adversarial system—ascribe the same meaning to "reasonableness" to cooperate in discovery? Is it reasonable to believe that adversarial parties are likely to reach an agreement as to what is "reasonable" in discovery? The Federal Rules of Civil Procedure answer with a resounding "yes."