That Qualification step was the challenge I had when working on scrum projects in the past. I might finish implementing a feature in the current sprint #1, but QA won't get to start testing until sprint #2. When QA inevitably finds bugs, when do I fix the bugs? Should I have reserved an unknown amount time in sprint #2 for bug fixing? Or should I schedule time in sprint #3 to fix those bugs? If so, then the separate implementation/QA/bug fixing stages are each adding extra latency.