Blog · AI & decision

S&OP, S&OE, MPS: who decides when the plan breaks?

S&OP builds the plan and the MPS breaks it down, but neither says who decides when reality drifts. That moment is called S&OE, and here is how to equip it.

By Mansour Niang, CEO & co-founder, Clevizio·Published July 3, 2026·8 min read

Key takeaway

S&OP balances demand and capacity on a monthly cycle, and the master production schedule (MPS) breaks it down product by product, week by week. Neither one tells you what to do when reality drifts between two cycles: that moment belongs to S&OE, execution over the zero-to-three-month horizon, which is still rarely formalized. Three building blocks are enough to equip it: a short ritual focused on deviations, escalation rules and systematic costing of the options.

Putting the acronyms back in their place

S&OP (Sales and Operations Planning, called PIC in France) is mid-term planning: it aligns commercial demand with industrial capacity, monthly and by product family. The master production schedule, or MPS (PDP in French), breaks it down over a shorter horizon, product by product, week by week. Together they build the plan, meaning what the company commits to produce and deliver, and when this framing work is done well it prevents a huge number of crises. That needs saying clearly, because the rest of this article is about their limits: a good S&OP and a good MPS remain the foundation, and nothing that follows replaces them.

The gap between two cycles

S&OP runs once a month and the MPS is replayed weekly, while disruptions keep to no calendar at all: a supplier lets you down on a Tuesday, a surge in orders lands on a Friday, a machine stops in the middle of the night. Between two plan reviews, when reality drifts, none of these processes says what to do, and the plan keeps existing on paper while it is already wrong on the shop floor. I call this the blind spot of traditional planning: everything is designed to build the plan, almost nothing to live with a plan that breaks.

S&OE, the link almost nobody has formalized

This moment has a name that is still little known: S&OE, Sales and Operations Execution. Where S&OP answers the question of the best possible plan, S&OE answers the uncomfortable one: what do we do when the plan no longer holds, this week, today, within the hour? S&OE covers the zero-to-three-month horizon, where you no longer replan, you make trade-offs: push back one customer or another, pay for express freight or accept the delay, draw on safety stock or launch another production run. Few companies have formalized it and few tools address it, because it falls between two stools: too tactical for planning teams, too decision-heavy for execution systems.

The four processes in one table

These four processes blur together in conversation but are perfectly distinct in practice, by their horizon, their level of detail and above all by who decides. The table below puts each one back in its place.

Process	Horizon	Level of detail	Frequency	Question addressed	Who decides
S&OP (PIC in French)	3 to 18 months	Product family	Monthly	Do demand and capacity balance?	Executive leadership and functional heads
MPS (PDP in French)	Weeks to 3 months	Finished product	Weekly	What do we produce, and in what order?	Planning manager
MRP and scheduling	Days to weeks	Component, production order	Daily	What do we need, on which machine?	Planner and shop floor supervisor
S&OE	0 to 3 months	Event, critical SKU	Continuous	What do we do now that the plan is drifting?	Nobody designated, most of the time

The tools that claim S&OE

A handful of vendors now claim S&OE territory, and it is worth looking closely at what each one covers. RELEX, Slimstock with Slim4 and FuturMaster with Bloom offer detection of plan-versus-actual deviations, configurable alerts and fast replanning. Control towers and suites such as SAP IBP or Kinaxis bring end-to-end visibility and simulation. All of them do the first half of the job well: seeing the deviation and recalculating. What remains rare is the second half: costing each possible option in euros of margin at the moment of the trade-off, and keeping a memory of the decision made for next time. That is precisely the half that determines the final cost of a disruption.

Who actually decides today when the plan breaks?

Ask the question in any mid-market manufacturer and the answer sounds the same: a few experienced people, under pressure, with partial data. A crisis cell is pulled together within the hour, everyone brings their own extract, there is a heated discussion, then someone decides on instinct and escalates the big trade-offs to the executive committee. The most striking part is that these decisions, which often weigh more than the plan itself, leave no trace: the reasoning lives in the heads of two or three experts, and it leaves with them the day they change roles. The organization then replays the same crises with an empty memory, as if every disruption were the first.

What formalized S&OE looks like

Formalizing S&OE does not require a major project, and certainly not touching your existing S&OP. It takes three things. A short ritual at a tight cadence, daily or twice a week, focused on plan deviations above a threshold, with the authority to decide in the room. Clear escalation rules, so everyone knows which level of impact gets settled in the execution meeting and which goes up to leadership. And a costing discipline: every trade-off made with the cost of the rejected options alongside it, even as an order of magnitude. Organizations that hold to this framework usually discover that half of their emergencies were not emergencies at all, and that the other half get decided much faster when the options arrive with a price tag.

Equipping the moment of decision

Closing this gap does not mean changing your S&OP or your MPS, which do their planning job well. It means adding the missing layer at the S&OE level: a system that monitors the gap between plan and actuals, detects drift early, costs the impact of the possible options in euros of margin and keeps a memory of the trade-off for next time. The best planning in the world will always produce plans that reality contradicts, and margin is increasingly won or lost in the quality of the response to that contradiction. The plan stays with planning, and the decision on a disruption finally deserves its own tool.