المدخل الفعلي
- Chart data and encoding
- Clustered bars titled 'Reservation collection before expiry'. Prior period: 107/198, 54%; reminder pilot: 131/214, 61%. Y-axis starts at 50% and ends at 65%. Labels show 54 and 61 but not n. Source cells Pilot!B4:C5; adult patrons who opted in only. Six records with unknown collection status were excluded: 2 prior, 4 pilot.
- Method and limitations
- Two consecutive six-week periods in 2026, not randomized. Seasonal title mix differed. Percentages use known-status records as denominators. No confidence intervals calculated. Pilot log revised 26 Aug after duplicate removal. This comparison cannot establish that reminders caused the difference.
- Audience and decision context
- Library director, 45 seconds. Decide whether to fund design of a randomized follow-up test. Avoid 'increase', 'improved', 'worked', or 'significant'. Next slide covers opt-outs and staff workload.







