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Forecasting
All our articles on Forecasting.
Forecast accuracy metrics that actually matter: MAPE, WMAPE and bias
How to measure forecast error the right way — why plain MAPE can mislead you (with a worked example), when to use WMAPE, how bias quietly piles up inventory, and what FVA reveals about your process.
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How to forecast sales in Excel (and when the spreadsheet stops being enough)
A hands-on tutorial: moving averages, FORECAST.LINEAR and FORECAST.ETS with seasonality, step by step. Plus the documented limits — one series at a time, no external variables — and the signs you've outgrown the sheet.
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5 forecasting failures that cost millions
Five documented demand-planning disasters — Cisco's $2.25B write-off, Nike's $100M i2 failure, Target Canada's collapse, KFC's empty stores and Walmart's 2022 inventory glut — what each one cost, what failed, and what would have prevented it.
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