Dragonfly Requirements Management Process Through Mission PDR

This paper discusses the NASA New Frontiers Dragonfly mission requirements management plan and how it has evolved from program kickoff to Mission Preliminary Design Review (PDR). The changes were based on reviewer and team member feedback, lessons learned on the Dragonfly project, plus lessons learned from other projects such as Parker Solar Probe (PSP), Double Asteroid Redirection Test (DART), and Interstellar Mapping and Acceleration Probe (IMAP). It concludes with the planned requirements management adjustments as the project progresses to Critical Design Review (CDR).The first revision of the requirements management plan was written using the methodology of the Johns Hopkins Applied Physics Laboratory’s (JHU/APL) Quality Management System (QMS), incorporating lessons learned from PSP and DART missions. Between the Independent System Requirements Review (SRR) and Mission Preliminary Design Review the plan and approach were modified to better serve the needs of the project. Areas of the plan with the most changes included the requirements schema, the process for using the requirements management tool, and the engagement with the change control board.The requirements schema has been updated to include sub-levels to allow for exceptions due to subsystems fulfilling both science and mobility requirements and to support science requirements flowing to instruments. The trade study selected requirements management tool has since been configured and informally integrated to allow secure access for partners and vendors, extension of functionality with scripting, and integration with a model-based systems engineering (MBSE) tool to prepare analyses for requirements owners. As the project lifecycle progressed and Preliminary Design Review approached, use of a change control board process was phased in by requirement level to align stakeholders on the changes and determine their full impact up and down the requirements hierarchy.Moving forward beyond Mission PDR towards CDR, the Dragonfly requirements team will work to continuously improve the requirements management process through regular feedback solicitation from project team members and analysis of requirements and verification data in order to produce the best possible requirements management process for the project.