The S&OP Process: Steps, Roles, and Cadence

The S&OP process works when it is run to a calendar, with defined inputs, clear roles and decisions that are recorded and followed up. The core S&OP process steps are simple to list and hard to run well. Many companies say they have S&OP and in fact hold a monthly meeting at which slides are presented and little is decided. The difference between that and a working process is in the details: who prepares what, by which day, what the meeting must decide, how scenarios are compared and how decisions are tracked. This guide sets out the steps in detail, with a sample calendar, a RACI, a list of materials for each meeting, a worked comparison of two plan scenarios with checked arithmetic, and rules for making decisions. It is part of demand planning and inventory optimization, follows what S&OP is and consensus demand planning, and leads to S&OP vs. IBP and the S&OP meeting agenda template. The plan it produces drives the figures in cash flow management.

The five steps in detail

Step 1: Data gathering and statistical forecast (working days 1 to 3)

The planning team closes the previous month, refreshes actuals for sales, shipments, orders, inventory, backlog and supply performance, and updates the statistical baseline. They flag anomalies and check accuracy and bias of last cycle's plan. Output: a clean data set, an updated baseline and a short accuracy report.

Step 2: Demand review (working days 4 to 7)

The demand planner collects commercial inputs: promotions, price changes, launches, customer plans and risks. A one-hour meeting with sales, marketing and finance reviews the baseline and the proposed adjustments, resolves differences and produces an unconstrained demand plan with stated assumptions and risks. Output: the approved demand plan for the full horizon and a list of open assumptions.

Step 3: Supply review (working days 8 to 11)

Operations, procurement and logistics test the demand plan against capacity, material availability, labor, lead times and inventory targets. They propose a supply plan and identify gaps, with options and costs: overtime, additional shifts, outsourcing, expediting, inventory builds, allocation or changes to the demand plan. Output: a supply plan, a gap analysis and a costed list of options.

Step 4: Pre-S&OP or reconciliation (working days 12 to 14)

A smaller group reconciles the demand and supply plans, builds the financial view (revenue, gross margin, inventory, cash), compares it to the budget and prior plan, and develops scenarios for the decisions that remain. The group prepares a recommendation and the pack for the executive meeting. Output: a recommended plan, scenarios with financial impact and a list of decisions required.

Step 5: Executive S&OP meeting (working days 15 to 17)

Executives review the recommendation, ask questions, decide, and sign off. The meeting should make decisions, not recite results. Output: the approved plan, decision log, action list and any changes to targets or policies.

A sample calendar

The cycle length depends on how quickly your data closes. A cycle of 15 to 20 working days is common. What matters is that the dates are fixed and visible a year ahead.

Roles: a simple RACI

A is accountable (one per row), R is responsible, C is consulted, I is informed. Adjust to your organization. The most important rule is that every decision has one accountable person.

Materials for each meeting

Demand review: baseline and adjustments by family, comparison to last cycle and to the budget, accuracy and bias, top changes and risks. Supply review: capacity and material availability against demand, inventory projections, service risk, options with costs. Pre-S&OP: reconciled plan, financial summary, scenario comparison, decisions needed. Executive meeting: a short pack (ideally under ten pages) with the recommended plan, the decisions, the financial impact and the risks. Send the pack two days ahead. Use the meeting for discussion.

A worked scenario comparison

Suppose the pre-S&OP group presents two options for the next 12 months (illustrative). Plan A is a conservative demand plan with revenue of $50.4 million, a gross margin of 38 percent and year-end inventory of $2.1 million above target. Plan B assumes a bigger promotional push, with revenue of $54.0 million, a gross margin of 35.5 percent because of promotional discounting and year-end inventory $2.8 million.

• Plan A gross margin: 50.4 × 0.38 = $19.152 million
• Plan B gross margin: 54.0 × 0.355 = $19.170 million
• Difference: B earns $0.018 million, or $18,000, more gross margin
• Extra inventory under B: 2.8 - 2.1 = $0.7 million; at an 18 percent annual carrying cost this is 0.7 × 0.18 = $0.126 million, or $126,000

Plan B generates $18,000 more gross margin but costs $126,000 more to carry, and it exposes the company to more risk if the promotion underperforms. On these numbers the executive team would choose Plan A, or ask whether Plan B's inventory could be funded and unwound more cheaply. Check: 50.4 × 0.38 = 19.152; 54.0 × 0.355 = 19.17; 19.17 - 19.152 = 0.018; 0.7 × 0.18 = 0.126. This does not include the extra revenue's effect on market share or the strategic value of the promotion. The point of a scenario comparison is to put the main numbers on the table so that the decision is deliberate. Add a column for risk: what happens to each plan if demand is 10 percent lower?

Decision rules

• Decide at the right level. Executives decide trade-offs and exceptions. Functional teams decide the detail.
• Use thresholds. Changes in volume or cost above set levels need executive approval.
• Freeze windows. Within a "frozen" period close to execution, the plan changes only for defined reasons.
• Record the reasons. A decision log with the date, decision, alternatives, rationale and owner.
• Escalate unresolved issues to the sponsor, with a deadline.

Keeping the process alive

Hold a short review of the process itself every quarter. Are meetings starting on time? Are inputs on time? Are decisions being made? Are actions closed? Is the plan trusted? Track a few process measures: on-time inputs, decisions per meeting, action closure rate and forecast accuracy. Rotate attendees if meetings go stale, but do not let the sponsor delegate. Adapt the calendar to seasonal peaks, with extra checkpoints. See S&OP KPIs.

Common mistakes

1. Presenting data without decisions.
2. Late or missing inputs.
3. No supply constraint review.
4. Skipping the financial reconciliation.
5. Too many items in the pack.
6. No decision log or follow-up.
7. Changing the calendar monthly.

FAQs

What are the steps of the S&OP process?

Data gathering, demand review, supply review, pre-S&OP reconciliation and the executive meeting, repeated monthly.

How long does the S&OP cycle take?

Usually 15 to 20 working days from the close of the month to the executive meeting.

What should the executive S&OP meeting decide?

Trade-offs that functional teams cannot resolve: capacity and inventory investments, allocation, promotions, launches and the approval of the plan.

Who owns the S&OP process?

A process owner or S&OP leader, with an executive sponsor who is accountable for the decisions.

How do I know the process is working?

Plans are on time, decisions are recorded and followed up, accuracy and service improve and functions use the plan as their single reference.