They are NOT the same.
They have different objectives.
They perform different activities.
They live in different worlds.
But, of course, their worlds are interconnected.
This infographic about demand vs supply planner received lots of attention on LinkedIn. It applies to middle and large companies. At smaller companies, I have seen these roles concentrated on the same team member.
Let’s break down the key differences and how these roles collaborate to keep the supply chain running smoothly.
1. Focus: Predicting vs. Optimizing
The Demand Planner focuses on forecasting future demand.
To accomplish this, it is important to understand the data to predict what, when, and how many customers will buy.
This is the unconstrained forecast; an estimate of the demand when the sales team can sell all they want.
The Supply Planner takes this unconstrained forecast and optimizes resources, ensuring inventory and production align while minimizing costs.
A perfect forecast is useless if supply can’t meet it. Likewise, the most efficient production plan fails if demand is misjudged.
Success lies in synergy.
2. Key Activities: Forecasting vs. Execution
Demand Planners identify anomalies, refine forecasts, and provide a clear picture of unconstrained demand.
It is fundamental that they collaborate with sales, marketing, and finance to fine-tune the forecast.
Supply Planners turn that forecast into action, managing inventory, capacity, and procurement to meet demand efficiently.
Demand planners ask “What will happen?”
Supply planners answer “How can we make it happen?”.
3. Stakeholders: Who Do They Work With?
Demand Planners collaborate with sales, marketing, finance, new product teams, and supply planners to shape the demand signal.
Supply Planners engage with manufacturing, procurement, materials planning, and finance to ensure resources align with the demand plan.
Cross-functional collaboration is critical to estimate and meet demand.
4. Negotiation Skills: Influence vs. Execution
Both negotiate. However, the negotiation is different.
Demand Planners must navigate internal politics. They negotiate forecast adjustments with sales, marketing, and finance.
Supply Planners negotiate with suppliers and production teams. This allows to secure capacity, materials, and favorable terms.
It’s a delicate balance on inventory. Demand planners push for more inventory to capture sales. Supply planners push back to control costs and risks.
5. Data: The Foundation of Planning
Data, data, data.
Data is the foundation.
Both demand and supply planners use data differently.
Demand Planners rely on point-of-sale (POS) data, shipments, orders, and statistical models to predict future demand.
There is an increase in the use of machine learning models.
I have seen that this is not a luxury. It is because a statistical forecast doesn’t work in many cases.
Supply Planners use capacity, inventory levels, and resource optimization models to determine the best way to fulfill demand.
The challenge in supply chain is that relationships are not linear.
Both roles use data. Both roles depend on data accuracy. A forecasting error can lead to either excess inventory or lost sales, both of which hurt the business.
6. Demand: Unconstrained vs. Constrained
I touched on the difference between unconstrained and constrained demand on the first point.
Demand Planners work with unconstrained demand. This is what customers ideally want without considering supply limits.
Supply Planners translate this into constrained demand. This is the adjusted demand after considering inventory and production realities.
This back-and-forth ensures the forecast isn’t just optimistic but achievable.
7. Metrics: Measuring Performance for Success
Metrics for Demand and Supply Planners are different too.
Demand Planners track Forecast Value Added (FVA), MAPE, WMAPE, and bias to evaluate forecast accuracy.
Supply Planners focus on On-Time In-Full (OTIF), fill rate, lost sales, and inventory turnover to measure supply performance.
One focuses on demand accuracy.
The other ensures supply reliability.
Both impact the customer experience.
In supply chain, at the end (and start too), it’s all about the customer.
8. Technology: Tools and Applications
Demand Planners rely on advanced forecasting tools and data visualization software.
It is becoming more common that demand planners work with data scientists on machine learning (ML) models.
However, statistical models in Excel still play a key role, even in large businesses.
Supply Planners use ERP, planning systems, and inventory management tools to execute plans.
9. Financial Impact: Revenue vs. Cost
Supply chain has a HUGE impact on the financials. I know I sound like a broken record with this.
Demand Planners primarily impact the top line (revenue) by capturing demand accurately.
Supply Planners influence the bottom line (costs) by optimizing inventory, reducing waste, and improving efficiency.
However, shortages and late shipments can also hurt revenue. This is a clear sign that shows how interdependent these roles are.
Conclusion
Demand and Supply Planners are NOT the same. The key is to understand each role, the differences, and how best they can work together for a GREAT supply chain.
