The terms MRD, or Market Requirements Document, and PRD, or Product Requirements Document, are often used interchangeably. However, both documents are actually intended to serve a separate and distinct purpose. The core purpose of an MRD is to clearly articulate: A focused definition of the target market Buyer and user profiles Problem scenarios which document gaps or issues that various personas are currently challenged with The actual format for a Market Requirements Document can vary. The most common formats include; a Word document, specialized software, wiki’s, or even a spreadsheet. The actual amount of documentation is dependent upon the size and scope of the targeted opportunity and company expectations. PRD’s on the other hand, are intended to provide the level of detail needed for the development team to understand the capabilities, functionality, and features that are required to address the market needs identified in the MRD. In other words, a strong PRD defines the breath and scope of the product capabilities sufficiently that the development team knows not only what to build but enables the discussion to shift to how to build it.