Engage FDA strategically, plan your testing, then assemble the submission.
The temptation in Stage 03 is to skip directly to the 510(k) and figure out the testing later. That order has bankrupted companies. The chronologically correct sequence starts with the Pre-Submission (Q-Sub) Strategist — a free FDA meeting that, done well, saves 6–12 months of wrong-path development. Only after FDA has signaled how they think about your device do you commit to the Test Plan that specifies what to actually run. The 510(k) Submission Builder comes last, assembling completed test results into RTA-checklist-compliant sections.