4.4Shift-Left in Practice: A Sprint Timeline

Day 1 (Sprint Planning):
  QA reviews stories, asks clarifying questions, identifies dependencies

Day 2-3:
  Three amigos sessions for the highest-priority stories
  QA writes draft test cases from acceptance criteria
  QA prepares test data and environment

Day 4-7:
  Developers implement features
  QA reviews PRs as code is written (not after)
  QA runs automated tests on feature branches
  Pair testing on complex features

Day 8-9:
  Exploratory testing on completed features
  Full regression run

Day 10 (Sprint End):
  Sprint review with quality metrics
  Retrospective with shift-left insights

Notice that QA is active from Day 1, not waiting until Day 7 when "code is ready for testing."