S&OP – InPhroNeSys

S&OP: Everyone Signed Off on the Number. It Was Still Wrong by 8.2%.

Juli 1, 2026

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by

in Operations Management, Supply Chain Management

A consensus forecast measures agreement, not truth. Here is what a textbook S&OP cycle looks like, why the signed-off number still ran 8.2% high, and the four moves that fix it without a full process overhaul.

Does Your Forecast Beat a Sticky Note? The Placebo Test for Demand Planning

Juni 28, 2026

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by

Philipp

in Forecasting, Supply Chain

Your forecast has exactly one job: beat a sticky note that says ’same as last year.‘ Most don’t. Here’s the placebo test that proves it.

30 Books Every Forecaster, Demand Planner, and S&OP Lead Should Read — The Inphronesys Bookshelf

Apr. 29, 2026

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by

Philipp

in Forecasting, S&OP, Supply Chain Management

An interactive 30-book bookshelf for forecasters, demand planners, S&OP leads, supply chain strategists, and the data scientists who keep them honest. Filter by category and level, build a reading list for your role.

When the Algorithm Is Wrong and the Expert Is Right

Apr. 20, 2026

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by

Philipp

in Forecasting, Operations Management, Supply Chain Management

Statistical models don’t know about your supplier’s factory fire, your competitor’s clearance sale, or the regulation that just changed. Here’s when expert judgment beats the algorithm — and the biases that make it worse.