The Nine Commandments of Supply Planning Success: What would you add to this list?

Supply planning is a critical part of the Integrated Business Planning (IBP) process, yet for many companies, it remains one of the most misunderstood and underdeveloped capabilities—even for those with advanced planning systems and a mature S&OP process. Despite considerable investments in technology, the fundamentals of supply planning are often lost in the mix, preventing companies from realizing its full potential as a driver of strategic value.

Let’s be clear: supply planning isn’t just about managing inventory or developing supply plans that drive production. It’s about making the right trade-offs, optimizing resource allocation, and ensuring every decision aligns with the broader corporate goals. Yet, many companies miss the mark, either getting stuck in a cycle of reacting to immediate issues or over-relying on technology that can only be effective if the fundamentals are in place.

The Evolution of Supply Planning

Traditionally, supply planning was a reactive effort focused on replenishment and firefighting. Planners would operate from spreadsheets, relying on rough forecasts to ensure that stock levels stayed sufficient. It was a constant struggle—if customer demand surged unexpectedly, the team would scramble, usually leading to expedited shipping, inflated costs, or dissatisfied customers.

Over time, companies have evolved to embrace Sales and Operations Planning (S&OP) and, more recently, Integrated Business Planning (IBP) as frameworks to integrate supply, demand, and financial plans. While S&OP has fostered better alignment between sales and supply chain teams, many organizations still fall short in leveraging supply planning as a strategic asset. This gap often stems from neglecting critical principles that underpin effective supply planning.

To address these shortcomings and crystallize what truly matters in supply planning, we have distilled our 20+ years of experience helping clients transform their supply planning functions into nine key commandments. These principles define what makes a supply planning function exceptional, yet they are frequently—and flagrantly—overlooked.

The Nine Commandments of Supply Planning Success

1. Thou Shalt Segment Thy Supply Chain

The first rule of effective supply planning is understanding that not all products, customers, or suppliers are the same. Segmentation is non-negotiable—each product must have a strategy based on its value, demand variability, and customer importance. High-value products or critical customers deserve a different planning approach compared to commodities or transactional clients.

A leading consumer goods company learned this lesson the hard way. For years, they struggled to maintain profitability during supply chain disruptions. It wasn’t until they segmented their supply chain—on the basis of margin, variability and volume—that they were able to design targeted supply strategies. This allowed them to prioritize properly in constrained situations, ensuring they remained profitable even under tough conditions.

2. Thou Shalt Align Supply Chain Policies with Corporate Goals

Supply planning decisions must serve the company’s strategic goals. Every action—whether increasing safety stock, optimizing batch sizes, or setting service levels—must be evaluated for its impact on broader business objectives like increasing profitability or expanding market share. Misalignment of supply policies is the root cause of many failures in supply planning.

Consider a specialty chemical manufacturer supplying adhesives to the aerospace industry. When the company identified a strategic goal to capture market share in the premium adhesives segment, they revamped their supply planning to prioritize these products. By integrating insights from marketing and finance, they optimized the end-to-end supply chain for these adhesives to ensure premium adhesives were always available to meet demand. The supply policies and the cost vs. service tradeoffs implied by those policies for this supply chain were very different vs. rest of their portfolio. This alignment not only improved service levels for key accounts but also supported the strategic objective of market expansion, demonstrating how supply planning can directly impact business outcomes.

3. Thou Shalt Master Trade-Offs

Supply planning is inherently about trade-offs: balancing costs, lead times, service levels, and capacity. The ability to evaluate these trade-offs effectively, understanding their business implications, and aligning them with corporate goals is what sets apart a great supply planning team from an average one. Few organizations excel at managing these trade-offs proactively.

One pharmaceutical company provides a perfect example of this challenge. They had historically maintained high levels of inventory to avoid stockouts and ensure excellent service. However, this led to rising costs, expensive write-offs, long delays before productivity improvements showed on the P&L, and ultimately impacted profitability. To address this, they adopted a structured approach to evaluate trade-offs—balancing production efficiency, service targets, and inventory costs. This method allowed them to reduce inventory carrying costs while maintaining service levels, ultimately optimizing both profitability and reliability.

4. Thou Shalt Not Covet Thy Functional Glory

Supply planning cannot happen in isolation. It requires collaboration between sales, finance, procurement, and production to ensure plans are realistic and actionable. In many companies, silos focused on functional optimization are the enemy of value creation—breaking them down is crucial for success.

A petrochemicals company was experiencing production delays and frequent plant stoppages due to poor communication between procurement and production teams. Raw materials would often arrive late, and production would grind to a halt. By instituting frequent cross-functional planning meetings, they fostered better alignment across departments. This collaboration reduced lead times, improved the availability of raw materials, and prevented costly production delays. The result was a significant boost to production stability and reduced inefficiencies.

5. Thou Shalt Be Proactive, Not Reactive

Great supply planning means anticipating disruptions and planning for them. Scenario planning is essential in many industries, especially where lead times are long, and production processes are complex. Being reactive isn’t an option—it’s a sign of a broken system.

A specialty chemicals company faced this challenge when they were dependent on a key raw material from a single supplier. Instead of waiting for potential disruptions, they implemented scenario planning, preparing several “what-if” models. When their primary supplier had an unexpected shutdown due to plant fire, they already had a contingency plan in place. By quickly switching to an alternative supplier, they avoided a complete production standstill, proving the value of proactive scenario planning.

6. Thou Shalt Not Worship False Metrics

Many companies often drown in a sea of metrics. The best supply planning teams know to ignore the noise and focus on the metrics that truly matter. It’s not about tracking everything—it’s about tracking the right things and understanding how they link to overall business outcomes.

A global chemical producer initially tracked over 20 different KPIs for their supply chain, resulting in confusion and diluted focus across the planning team. Realizing this was counterproductive, they streamlined their focus to four core metrics—forecast accuracy, margin velocity, on-time in-full (OTIF) delivery, and inventory days. Each of these metrics was directly tied to profitability and service goals that the CFO cared about. By making these metrics highly visible and aligning team incentives with these focused KPIs, the company significantly improved its operational performance and gained clarity in its decision-making.

7. Thou Shalt Prioritize Actions Based on Value, Not Just Volume

Effective supply planning must prioritize based on value, not just volume, to ensure the most impactful decisions are made. Two key concepts guide this approach:

• Margin Velocity: This measures contribution margin per hour of asset time, providing a clear metric to dictate capacity allocation. By focusing on margin velocity, planners can prioritize high-value products that maximize the return on constrained capacity.
• Pocket Margins: Unlike gross or contribution margin, pocket margins reflect the actual realized margin after accounting for cost-to-serve factors like freight, discounts, and rebates. Pocket margins should drive cost-to-serve decisions, ensuring resources are allocated efficiently and aligned with profitability goals.

A specialty chemicals manufacturer facing capacity constraints applied these principles. By calculating margin velocity, they reallocated asset time to high-margin specialty products, improving profitability. Similarly, for another industrials company, pocket margin analysis revealed unprofitable customer accounts due to unrecovered freight costs, due to freight-included pricing. For some of these customers where price adjustment was not an option, adjusting service levels and MOQs for these accounts improved profitability, showcasing the power of value-driven prioritization.

8. Thou Shalt Leverage Historical Data for Insights, Not Just Forecasts

Historical data is essential for Forecasting, but don't stop there. Historical data offers deeper insights to improve both demand and supply planning:

• Demand Side: Historical data reveals customer buying patterns and ordering behaviors, such as order frequency, order timing and order size. A chemical company used this data to identify customers placing last-minute bulk orders which disrupted plant operations, enabling them to have a dialog around lead time policies and also where that was not an option, proactively adjust safety stock levels and avoid disruptions. Similarly, historical order size analysis can lead to significant insights on cost-to-serve and freight choices.
• Supply Side: Historical data also sheds light on supply-side variables like lead times, supplier reliability, and production asset behavior. For instance, a chemicals company discovered recurring delays in raw material deliveries during certain months. Armed with this insight, they renegotiated delivery terms with suppliers and introduced alternative sourcing options, reducing variability and ensuring smoother operations.

By mining insights from rich historical data, companies can create more resilient and reliable supply chains.

9. Thou Shalt Close the Loop Between Plan and Execution

Plans often falter because they fail to reflect real-world constraints and execution realities. Closing the loop between planning and execution requires not only monitoring outcomes but also ensuring the planning approach itself is realistic.

A chemicals company facing poor schedule adherence initially blamed plant operators, accusing them of deviating from the plan. However, a deeper analysis revealed the root cause: their planning tool embedded a discrete monthly planning philosophy, which ignored the capacity impacts of sequence-dependent changeovers and the need for longer runs. As a result, monthly rough cut plans were infeasible from the start. This initiated a significant change to how planning was done and the roles of planning vs. scheduling in the overall IBM process.

The Role of Control Towers in Supply Planning

A control tower is not just a fancy term for a dashboard containing a smorgasbord of metrics and trend charts. In the context of supply planning, it is the nerve center of operations—offering true visibility across production, logistics, procurement, and demand in real time.

But the true value of a control tower isn’t in the data it provides; it’s in the focus it creates. A good control tower doesn’t overwhelm planners—it surfaces the key issues and opportunities, making clear where action is needed to maximize value.

For a large chemical company dealing with unpredictable fluctuations in raw material prices, their control tower provided near real-time alerts about price changes and potential supply shortages. This enabled the supply planning team to make informed decisions quickly—adjusting sourcing strategies and production schedules to mitigate risk. By identifying these issues early, the company reduced its exposure to price volatility and avoided the typical scramble that comes with unforeseen supply chain issues.

Why Most Companies Struggle

Despite the clear benefits of effective supply planning, many companies struggle to implement it well due to some common challenges:

• Data & Functional Silos: Disconnected data sources and functional silos prevent a comprehensive view of the supply chain, making aligned decision-making impossible.
• Resistance to Change: The cultural inertia in many companies prevents the adoption of new processes and practices.
• The Complexity of Trade-Offs: Balancing cost, service, and efficiency in a highly technical and regulated environment is a constant challenge.

More on this in our next article in this series, but also interested in hearing your thoughts in the comments on this.

Conclusion: Embrace the Fundamentals

Supply planning is a game-changer for many industries — but only if done well. The fundamentals aren’t glamorous—they’re about alignment, segmentation, trade-off management, collaboration, proactive anticipation, and focusing on the metrics that matter. Technology, control towers, and advanced analytics are all powerful enablers, but without the foundational principles, they are like building a skyscraper on sand.

The companies that master these fundamentals will be the ones to lead the industry, turning their supply chain into a true competitive advantage and not just a cost center. It’s time to stop being reactive and start making supply planning the strategic powerhouse it was always meant to be.

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