S&OP: Why Sales and Operations Planning Is Worth Getting Right
Most supply chain crises — stockouts that lose sales, inventory buildups that lock up working capital, delivery commitments that cannot be kept — are not caused by external shocks. They are caused by internal misalignment: the demand side and the supply side of the business operating from different numbers, with different assumptions, without a regular process to surface and resolve the gaps between them. Sales and Operations Planning exists to close that gap. Done well, it is one of the highest-leverage management processes a business can have. Done as ritual rather than real decision-making, it absorbs management time and produces nothing.
The five steps of the S&OP process
Product review. The cycle begins with a review of the product portfolio: new products entering the market, products approaching end-of-life, significant product changes that affect demand patterns or supply requirements. A new product launch without adequate supply planning creates stockouts; an end-of-life product without managed rundown creates excess inventory.
Demand review. The demand review produces a consensus forecast by product family — a single number the business is prepared to plan to. It must integrate all available demand signals: sales pipeline data, historical actuals, market intelligence, and promotional plans. The common failure is submitting the sales team's optimistic pipeline without statistical adjustment, producing a forecast consistently above actual sales that supply cannot plan to.
Supply review. The supply review tests the demand plan against capacity: manufacturing capacity, procurement lead times, supplier constraints, and inventory positions. Where demand exceeds capacity, the supply review quantifies the gap and generates options — additional shifts, outsourcing, inventory pre-build. The output either confirms the demand plan is achievable or defines the trade-offs required.
Financial review. The financial review translates demand and supply plans into revenue, gross margin, inventory value, and working capital implications. This is where S&OP connects to the business's financial commitments. Finance integration is what transforms S&OP from an operational exercise into true integrated business planning.
Executive S&OP. The executive meeting is where decisions get made: which customers get priority when supply falls short, whether a capital commitment is warranted to close a capacity gap, whether the business accepts a revenue shortfall or takes action to close it. Executive S&OP only works when executives attend prepared, make decisions with authority, and hold the organisation accountable for executing those decisions.
Why S&OP fails — and what a mature process looks like
S&OP fails for predictable reasons. The demand and supply teams do not trust each other's data, so each maintains a shadow plan rather than committing to the S&OP output — which defeats the entire purpose. Finance runs a separate forecasting process, so the two sets of numbers never reconcile and the business never achieves a true integrated view. Executives delegate the monthly meeting to director level or end it without decisions, and the operational teams learn the process has no authority and prioritise other things. The process drowns in SKU-level detail when it should operate at the product family level — strategic decisions do not get made when the meeting is consumed by operational minutiae. A mature S&OP process has a statistical demand forecast plus informed judgement; supply trusts the plan enough to pre-build inventory; finance treats the S&OP output as the input to the financial forecast; and the executive meeting is structured around decisions, with pre-reads circulated in advance so the time is spent choosing, not presenting.
If your organisation is running S&OP as ritual rather than a real decision-making process, or struggling to integrate demand, supply, and finance into a coherent plan, XNM's procurement and supply chain advisory helps leadership teams design, implement, and mature S&OP processes that drive real alignment and real decisions.