PRD / MRD (product and market requirements)
Beginner
The document where the business side writes down what customers want from the product and why.
Novice
Business documents written before engineering starts. A product requirements document (PRD) says what the product must do, without saying how. When a company’s marketing department writes it, it may be called a market requirements document (MRD); some companies keep a separate MRD for customers, competitors and price.
Expert
The upstream source for chip requirements. Each chip requirement should name the PRD item it serves, so that when the PRD changes, a script can list every chip requirement, test and budget affected.