The sales and operations planning (S&OP) process is a recurring cross-functional cycle, usually monthly, in which sales, operations, supply and finance agree on one plan for demand, supply and financial outcome. It replaces separate departmental plans with a single set of numbers and clear decisions about trade-offs.
A working S&OP process does not produce a perfect forecast. It gives leaders a regular point to review what changed, choose between options and commit resources.
The steps of the S&OP cycle
Companies name the steps differently, but most follow the same pattern.
- Data gathering: actual sales, inventory, backlog, supplier performance and capacity are updated and checked.
- Demand review: sales, marketing and planners build an unconstrained demand plan, including promotions, new products and known customer changes.
- Supply review: operations and procurement test whether the demand plan can be met given capacity, materials and lead times, and list gaps and options.
- Pre-S&OP meeting: the team reconciles demand and supply, converts the plan to financial terms and prepares recommendations and open decisions.
- Executive S&OP meeting: senior leaders decide on the options, approve the plan and assign actions.
- Execution and follow-up: the approved plan feeds master scheduling, purchasing and distribution, and results are compared with plan at the next cycle.
Inputs and outputs
| Stage | Typical inputs | Typical outputs |
|---|---|---|
| Demand review | Sales history, pipeline, promotions, market intelligence | Consensus demand plan, assumptions |
| Supply review | Capacity, material availability, inventory, lead times | Feasible supply plan, constraints, gap list |
| Pre-S&OP | Both plans, financial targets | Scenarios, recommendations, decisions needed |
| Executive meeting | Recommendations and risks | Approved plan, actions, owners |
Roles
- Executive sponsor: chairs the final meeting and resolves conflicts between functions.
- S&OP lead or process owner: runs the calendar, prepares materials and keeps the process consistent.
- Demand planner: builds the statistical forecast and manages the demand review.
- Sales and marketing: supply market knowledge and commit to the demand plan.
- Supply planning, production and procurement: assess feasibility and propose supply options.
- Finance: translates the plan into revenue, cost and cash, and checks it against the budget.
Common mistakes
- Treating the meeting as a status review instead of a decision meeting.
- Allowing sales and operations to keep separate numbers.
- Skipping the supply constraints and approving a plan that cannot be delivered.
- Changing the plan too often inside the frozen window, which creates instability.
- Measuring forecast accuracy but not acting on the causes of error.
- Missing senior attendance, so decisions are deferred.
- Ignoring finance, so the plan does not match the budget or cash position.
S&OP, IBP and where AI fits
Integrated business planning (IBP) extends S&OP by linking it more closely to strategy, finance and product planning, often with a longer horizon. Many planning tools now include machine learning forecasts and scenario modelling. These help produce a baseline faster and test what-if cases, but they do not replace the judgment calls about promotions, pricing or capacity investment. The quality of the process still depends on agreed assumptions and accountable owners.
Starting or fixing a process
- Define the planning horizon and cycle time for the business.
- Agree on a single set of data and product hierarchy.
- Write a meeting calendar and standard agenda.
- Define the decisions that must be made at each meeting, not only the reports presented.
- Track a few measures: forecast accuracy, plan adherence, service level and inventory.
- Review the process itself every year.
Common questions
How often should S&OP run?
Monthly is the most common rhythm. Fast-moving businesses may add weekly operational reviews between cycles.
Who owns S&OP?
A process owner runs it, but the plan belongs to the leadership team. If no executive is accountable, the process tends to fade.
Sources and further reading
- Association for Supply Chain Management (ASCM)
- Harvard Business Review: Supply Chain Management topic (Harvard Business Review)
- MIT Center for Transportation and Logistics (MIT CTL)