One Page for the Executive Committee When SPI and the Forecast Disagree
At a quarterly review, the earned-value dashboard shows SPI 0.92 and CPI 1.04. The CPM forecast shows completion 3 weeks earlier than the baseline, driven by a pulled-forward commissioning sequence. Remaining work is 6 months and includes 45 weather-sensitive days. The executive committee has 15 minutes, 1,900 activities in the schedule, and wants 'one page and a date.' A prior report was criticized for showing green when a milestone slipped.
1. What should be on the one-page report and why?
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The one-pager should answer three questions: where are we, where will we finish, and what decisions are needed. Include the top six to eight milestones with baseline, forecast, and variance; the forecast completion date as a range (P50 and P80), not a single date; the five driving activities on the critical path; the top risks with quantified exposure, including weather; and two or three decisions required from the committee. Use a milestone trend chart and a summary Gantt at Level 1–2, not the 1,900-activity schedule. Add a short confidence statement and a data-quality note. The prior criticism came from presenting a single green indicator; showing variance and range explicitly prevents that.
2. How do you explain SPI 0.92 alongside an early forecast?
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SPI 0.92 is a cumulative, cost-weighted ratio of earned value to planned value. It is backward-looking and mixes work packages of different value; near-term work may be low-value and high-effort, so SPI can lag while duration performance improves. It is not a forecast of completion. Explain the divergence with earned schedule: SPI-t converts earned value into time, and a schedule forecast based on the remaining critical path. If commissioning was pulled forward and is genuinely resourced, the early date is credible; if it depends on unconfirmed vendor support, it is not. Present both indicators and the reason for the difference, and avoid labeling the project 'behind' or 'ahead' on one index.
3. How should the weather risk be presented?
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Quantify the weather as a range. Run a schedule risk analysis with weather-day distributions on the weather-sensitive activities, and report the resulting P50 and P80 completion dates alongside the deterministic three-weeks-early date. State explicitly that 45 weather-sensitive days remain and that the early date may not survive a normal weather season. Recommend a decision: hold the early date as an unmitigated target, or carry contingency and report the risk-adjusted date. Do not average weather into a single number; show the range. If the committee wants a date, give the P80 date as the commitment and the P50 as the likely outcome, and note what would have to be true for the early date to hold.