Key information relating to requirements production is either lost or unrecoverable as a consequence of conventional requirements engineering practices. This includes, most significantly, information about the individuals and groups from whom requirements were originally elicited and by whom they were subsequently refined. An approach is outlined of rendering such information traceable, which anchors requirements and development information in the contribution structure from which it arose, and enables the workings of the requirements production process to be revisited in later phases of development. It is demonstrated how the use of the approach can prevent the premature freezing of requirements elicitation and allows us to establish the consequences of organisational change.