User requirements document

The user requirement(s) document (URD) or user requirement(s) specification is a document usually used in software engineering that specifies what the user expects the software to be able to do.

Once the required information is completely gathered it is documented in a URD, which is meant to spell out exactly what the software must do and becomes part of the contractual agreement. A customer cannot demand features not in the URD, whilst the developer cannot claim the product is ready if it does not meet an item of the URD.