Sales and operations planning (S&OP) sounds like jargon, but the idea is simple: once a month, the business agrees on one plan that balances what customers will buy with what operations can make and deliver, and what finance can fund. This post explains it without the buzzwords.
The problem S&OP solves
Without a shared plan, every function works from its own numbers. Sales commits to a forecast, operations builds to a different one, procurement buys to a third, and finance budgets to a fourth. The result is familiar: shortages on some items, excess on others, constant expediting, and leadership surprised at quarter end. S&OP replaces those competing numbers with one agreed plan and a regular forum to update it.
The five steps of a typical monthly cycle
Organizations describe the process in slightly different ways, but most follow a sequence like this:
- Data gathering. Close the prior month: actual sales, production, inventory, forecast accuracy and open issues. Refresh the statistical forecast.
- Demand review. Sales, marketing and planning agree on an unconstrained demand plan by product family, including assumptions and risks.
- Supply review. Operations, procurement and logistics test that demand plan against capacity, materials and supplier constraints, and propose options where there are gaps.
- Pre-S&OP (reconciliation). A cross-functional team, including finance, resolves conflicts, prices out scenarios and prepares clear decisions for leadership.
- Executive S&OP. Leadership reviews performance, makes the decisions the team couldn’t, and approves the plan that everyone will execute.
The output is a single plan, in units and dollars, usually by product family over a horizon of roughly 18 to 24 months, though the right horizon depends on your lead times and capacity decisions.
Where S&OP fits in the planning stack
Think of planning in layers. Strategic planning sets direction for the next several years. S&OP translates that direction into a monthly, family-level plan for the next year or two. Master scheduling and MRP then turn the agreed plan into specific items, quantities and dates. When the layers are connected, a decision made in the executive meeting shows up in purchase orders and production schedules within days, not quarters.
Who belongs in the room
- Sales and marketing own the demand plan and its assumptions.
- Operations and supply chain own capacity, materials and the supply plan.
- Finance translates plans into revenue, margin, inventory and cash, and keeps the plan connected to the budget.
- Product and engineering bring launches, phase-outs and design changes.
- An executive owner, ideally the general manager or president, who can make trade-off decisions.
Families, not SKUs
Executives shouldn’t debate individual part numbers. S&OP works at an aggregate level, such as product families or capacity groups, where decisions about people, equipment, inventory and suppliers are actually made. Detailed scheduling and master production scheduling then translate the agreed plan into item-level actions.
Metrics worth reviewing
Keep the dashboard short and consistent month to month:
- Forecast accuracy and bias by family
- On-time in full (OTIF) delivery to customers
- Inventory value and days of inventory on hand versus target
- Capacity utilization for constrained resources
- Supplier on-time delivery for critical parts
- Plan versus budget for revenue and margin
Common pitfalls
- Turning it into a forecast meeting. If the executive session only reviews numbers and makes no decisions, it isn’t S&OP yet.
- Skipping finance. A plan that doesn’t tie to dollars won’t hold when budgets get tight.
- Too much detail. Hundreds of slides at SKU level hide the real issues.
- Inconsistent cadence. The value comes from the monthly rhythm. Skipping months rebuilds the silos.
- No follow-through. Decisions need owners, dates and a review the next month.
Signs it’s working
You’ll notice fewer surprises at month end, fewer expedites, inventory moving toward target, and conversations that shift from “whose number is right” to “what should we do.” Those are behavioral signs, and they matter more than any single metric.
How software helps
S&OP is a management process first, but good tools make it easier. A clean data model for demand, supply and inventory, plus a few automated reports in Python and SQL, can cut the manual spreadsheet work that eats up the data-gathering week, so the team spends more time on decisions.
For training and certification, ASCM (Association for Supply Chain Management) is the leading professional body for planning, and the Institute for Supply Management (ISM) covers supply management. My Knowledge Base summarizes the cycle and key metrics on one page.
Peter Klausz is an MBA, the founder of Statadventure, LLC, and a former Pratt & Whitney F100 supply chain manager. He builds supply chain software in Python and SQL with AI-assisted development and is open to contracting and new roles. Get in touch.