Most manufacturing companies have at least one spreadsheet they would struggle to live without.

You know the one.

Perhaps it schedules production. Perhaps it allocates inventory. Perhaps it helps determine which orders get prioritized when capacity becomes constrained. Whatever its purpose, someone in the organization built it years ago, and over time it became an essential part of the business.

To be fair, that’s not necessarily a bad thing.

Microsoft Excel is one of the most powerful business tools ever created. I have yet to encounter a software implementation that didn’t start with somebody trying to solve a problem in a spreadsheet first. Spreadsheets are flexible, accessible, and great for working through new ideas before investing in a more formal solution.

The problem isn’t the spreadsheet.

The problem is when the knowledge behind it only exists inside the spreadsheet.

The Spreadsheet Everyone Depends On

Over the years, formulas get added, assumptions get adjusted, and workarounds get introduced. Eventually, the spreadsheet starts representing years of operational experience. Unfortunately, that experience is often understood by only a handful of people, sometimes only one.

At that point, the spreadsheet is no longer just a tool. It has quietly become part of your operational infrastructure.

This is usually where things get interesting.

As long as the spreadsheet keeps producing the right answers, nobody questions it. New employees learn how to use it but not necessarily how it works. Managers trust the output because they’ve always trusted the output. The process continues year after year without much thought.

Until one day something changes.

The person who built it retires. A formula breaks. The business grows beyond what the spreadsheet was originally designed to handle. Suddenly everyone realizes they depend on something they don’t fully understand.

When Knowledge Becomes Risk

This is the point at which operational knowledge becomes operational risk.

The overarching purpose of any manufacturing organization is not just to collect knowledge but to make that knowledge repeatable, scalable, and accessible. If a critical business process relies on information trapped inside a spreadsheet, then that process becomes increasingly difficult to improve, scale, or transfer to others.

Organizations often assume that because a process is documented in a spreadsheet, it is documented. In reality, many of the most important decisions, assumptions, and exceptions exist only in the minds of the people who built it. The spreadsheet captures the output, but not always the reasoning behind it.

That distinction becomes increasingly important as businesses grow, add facilities, onboard new employees, or attempt to standardize processes across multiple locations.

The Difference Between a Tool and a System

That doesn’t mean you should stop using spreadsheets. Far from it.

Spreadsheets are excellent sandboxing tools. They are often the perfect place to test a new idea, experiment with a planning approach, or validate a process improvement. But there comes a point where the value is no longer in the spreadsheet itself. The value is in the knowledge it contains.

Purpose-built systems exist to help organizations capture that knowledge, standardize it, and make it available to the broader business. The goal is not to replace expertise but to ensure that expertise becomes an organizational capability rather than an individual dependency.

When that happens, the question is no longer whether the spreadsheet works.

The question is whether your business can continue to evolve while relying on it.

And that is a very different conversation.