When an organization decides to "launch S&OP," the first question that comes up is usually: where do we start? Most available resources cover the mechanics of the monthly cycle — its five stages, its inputs and outputs — but far fewer address the sequence for standing it up in an organization that doesn't have the process yet. Our experience is that this rollout, done properly, takes roughly 90 days — not one week, and not one year.
Phase one (weeks 1–2) is diagnosis, and the most common mistake organizations make is skipping straight past it to designing the meeting calendar. Diagnosis means mapping the current state: which decisions about volume and capacity are already being made today, informally and scattered across the organization? Who actually makes them — not on the org chart, but in practice? And where does a clear pattern of excess or shortage show up that signals a coordination gap? Without this map, the new cycle gets built on guesswork instead of reality.
Phase two (weeks 3–4) is design: locking in the monthly calendar, defining who attends each stage (the actual owners of budget and capacity, not their delegates), and — most importantly — deciding what is deliberately left out of scope. A common mistake at this stage is trying to design a "complete" process that covers every product, every business unit, and every scenario from day one. That perfectionism usually produces a heavy design that never actually gets run.
Phase three (weeks 5–8) is the pilot run — and this is where this rollout path diverges most from common approaches: instead of launching company-wide all at once, we run one full cycle on a limited scope — a single product family or business unit. That narrower scope contains the risk and lets the team learn from early mistakes without exposing the whole organization to them. The pilot's executive meeting is the real test: do senior leaders actually show up and decide, or do they send delegates and push the decision downstream? The answer determines whether you're ready to scale or not yet.
Phase four (weeks 9–13) is scale-up and capacity transfer. Scope expands to the full portfolio, but at the same time — and this is the part that's most often forgotten — ownership of running the cycle transfers to the internal team, rather than staying permanently dependent on outside facilitation. This is exactly what sets our DDIT framework apart from more common approaches: most methods stop at "implement"; we add a distinct stage for transferring capacity to the internal team, because without it, the process only survives as long as the outside consultant is in the room.
The mistake that most often derails this 90-day path is trying to design a "flawless" process before running a single cycle. When an organization spends months writing procedures, defining roles, and building dashboards before a single real meeting happens, by the time that period ends the initial momentum has usually faded and the project quietly gets shelved. A limited pilot run, even with simple tools, always beats a complete design that never gets executed.
The success measure for these 90 days is the same one we use to assess the health of any S&OP cycle: out of the last three meetings, how many ended with a written decision, an owner, and a deadline? If by the end of phase four the answer is "most of them," the process has moved from a launch project to an organizational discipline — and from there, the conversation about investing in more advanced tooling or expanding into IBP becomes a real, evidence-based conversation, not an early bet.