Reviewing lessons learned matters for the following reasons:
Captures knowledge before it is lost - people forget specifics fast, and team members move on/get reassigned, taking undocumented insight with them.
Breaks repeat-mistake cycles - without a formal review, the same scheduling errors, scope creep patterns, or v issues resurface project after project.
Improves estimation accuracy - actual vs. planned data (cost, time, effort) feeds better forecasting on future projects.
Shows process/systemic issues, not just individual performance problems e.g., a recurring bottleneck might point to a broken approval workflow rather than a one-off mistake.
Builds organisational maturity - it's a core input for PMO-level continuous improvement and is explicitly part of standard frameworks.
Closes the loop for stakeholders - demonstrates accountability and gives sponsors confidence issues won't repeat.
Tip: A common mistake is just doing the review but never storing it anywhere searchable/actionable, make sure a register or log is stored somewhere that is eaily accessible, and is reviewed when any new bid is being undertaken.
