The value of a lessons learned session is zero if the lessons are not applied. Show how you turned a specific insight into a concrete process change for the next project.
Strong answers describe: structured retrospectives at project end (and at milestones), creating a safe space for honest feedback, capturing both what went well and what did not, converting insights into actionable changes, and actually applying lessons to future projects. Best candidates have examples of specific improvements that came from retrospectives.
Tests learning culture. Many teams do retrospectives but never change. Candidates who can trace a process improvement back to a specific lesson demonstrate genuine continuous improvement.