S&OP Isn't a Meeting. It's a Decision-Making Process.

S&OP is often described as a monthly meeting where Sales, Operations, Supply Chain and Finance get together to review the numbers.

That description isn't wrong, It just misses the point.

A useful S&OP process should help a business answer a much more important question:

What do we believe the business needs to achieve, can the supply chain actually deliver it, and what decisions do we need to make?

That requires more than a meeting, It requires a process.

Start with the demand

The first part of an effective S&OP process is understanding what the business currently believes demand will look like.

That doesn't mean believing the forecast is going to be right.

Forecasting doesn't predict the future.

It provides a structured view of what might happen so that the business can make decisions about what it needs to do next.

That means the demand position needs to be maintained, reviewed and challenged.

Changes in customer requirements, commercial activity and other relevant information need to be brought into the process.

The objective isn't to produce a perfect forecast, It's to establish a credible forward view of demand.

A practical five-stage S&OP process

For one customer, I designed and implemented a five-stage monthly S&OP cycle.

The process was structured around:

Demand Maintenance → Demand Review → Supply Review → Pre-S&OP → Executive S&OP

Each stage had a defined purpose.

1. Demand Maintenance

The demand position is maintained and prepared for review.

This provides the starting point for the S&OP cycle and ensures that the forward demand position reflects the latest available information.

The important point is that demand isn't simply taken from an order book and treated as fact.

The business needs to understand what it believes customers may require further into the future.

2. Demand Review

The demand position is then reviewed.

This is where changes, exceptions and relevant commercial information can be considered and challenged.

The objective is to establish an agreed view of future demand that can then be tested against the supply chain.

And that distinction matters.

The demand review isn't asking whether the forecast will be correct.

It's asking:

Is this the best view of demand we currently have, and are we comfortable using it to make supply decisions?

3. Supply Review

Now comes the reality check.

Can the supply chain actually deliver what the demand review is suggesting?

That means looking beyond production capacity.

Depending on the business, this may include:

• material availability

• inventory

• production capacity

• labour

• equipment constraints

• purchasing requirements

• supplier capability

• existing commitments

This is where the difference between demand and what the business can actually supply becomes visible.

A demand plan can look perfectly reasonable until somebody asks whether the operation has the capacity and materials to deliver it.

This is where S&OP becomes useful

Without a structured supply review, problems often remain hidden until they become operational problems.

A production schedule gets squeezed.

A material becomes urgent.

Purchasing starts expediting.

Production changes priorities.

Customer service starts explaining delays.

And everyone becomes busy.

But being busy isn't necessarily the same as solving the problem.

A good S&OP process creates visibility before that happens.

4. Pre-S&OP

The Pre-S&OP stage brings the demand and supply positions together.

This is where significant exceptions, risks and constraints can be identified.

Perhaps demand exceeds available capacity.

Perhaps a material requirement creates a purchasing issue.

Perhaps inventory is outside policy.

Perhaps the business has a commercial opportunity that the supply chain cannot currently support.

The important thing is that these issues are identified before the Executive S&OP meeting.

The purpose isn't simply to report the problem.

It is to understand the options and develop recommendations.

5. Executive S&OP

This is where the process reaches the business leadership team.

Executive S&OP shouldn't simply be another presentation of the numbers already discussed in previous meetings.

The information should now support decisions.

Where are the significant exceptions?

What are the consequences?

What choices are available?

What needs to change?

Who needs to take action?

This is where S&OP moves from being a planning process to becoming a business decision-making process.

And then there is the RACI

One of the less glamorous parts of S&OP is also one of the most important:

Who is actually responsible for what?

A process can look excellent on paper, but if nobody is clear about who owns the information, decisions or actions, it quickly becomes another meeting cycle.

For the S&OP process I implemented, responsibilities were defined across the key functions involved in the process, including:

• Sales

• Demand Management

• Forecasting

• Procurement

• Production Planning

• Materials Planning

The RACI helped establish who was Responsible, Accountable, Consulted and Informed at the appropriate stages.

That matters because S&OP crosses functional boundaries.

Demand isn't just a Sales responsibility.

Supply isn't just a Production responsibility.

Inventory isn't just a Warehouse responsibility.

And the consequences of decisions made in one area can appear somewhere else.

S&OP connects the supply chain

This is one of the reasons I think S&OP is so valuable when it is designed properly.

It creates a structured connection between:

Demand

↓

Supply

↓

Capacity

↓

Materials

↓

Inventory

↓

Business decisions

Instead of each function looking at its own part of the operation, the process creates a shared view of what is happening across the supply chain.

And that is important because:

Every decision in the supply chain creates a consequence — often somewhere else.

The meeting isn't the process

This is probably the biggest distinction.

You can have:

• a monthly S&OP meeting

• a demand forecast

• a supply plan

• a set of KPIs

• a presentation

• senior management attendance

…and still not have an effective S&OP process.

The real value comes from what happens between the meetings.

Is the demand position maintained?

Are assumptions challenged?

Are supply constraints understood?

Are exceptions identified?

Are responsibilities clear?

Are recommendations developed?

Are decisions made?

And, perhaps most importantly:

Do those decisions actually change what happens next?

What good S&OP should create

A practical S&OP process should give the business:

Better forward visibility

Not certainty about the future, but a clearer view of what might happen.

Earlier identification of constraints

Capacity, materials, inventory and other issues can be identified before they become urgent.

Clearer accountability

People understand their role in creating, reviewing and acting on the information.

Better cross-functional communication

Sales, Planning, Procurement, Production and Management work from a connected view.

Better decisions

Management can see the consequences of different options before committing to them.

S&OP isn't about producing more information

Businesses rarely suffer from a complete lack of information.

More often, they have lots of information that isn't being turned into useful decisions.

The purpose of S&OP isn't therefore to create another report.

It is to create a structured process that turns information into understanding, understanding into decisions, and decisions into action.

Demand → Supply → Exceptions → Decisions → Action

That's what makes S&OP useful.

A final thought

I've seen supply-chain problems become increasingly complicated because businesses try to solve the visible symptom rather than understanding how the different parts of the supply chain interact.

S&OP provides an opportunity to step back.

Instead of asking:

“What happened this month?”

we can start asking:

“What do we think is going to happen, what could prevent us from achieving it, and what do we need to decide now?”

That creates something much more valuable than another monthly meeting.

It creates time to make decisions before they become problems.

About HMS

At HMS, I help manufacturing businesses develop practical supply-chain planning, S&OP and operational processes that improve visibility, support better decisions and create sustainable change.

Because every decision in the supply chain creates a consequence — often somewhere else.

HMS Ltd — End-to-End Supply Chain Leadership & Transformation