An intern at a multinational company cannot run a design calculator that works perfectly for everyone else in the office. This is not a minor glitch; it is a demonstration of how fragile legacy spreadsheet tools have become. The file is the same. The Excel version is the same. The macro settings are the same. The laptop has been restarted. The file has been opened alone. Nothing changes. The error persists, and no one, not the senior employees, not the IT help desk, can explain why.
What makes this situation particularly frustrating is that the knowledge required to fix it has already left the building. The employees who built the VBA project are gone. Their logic, their dependencies, their undocumented assumptions about file paths and system configurations, all of it is locked inside a macro that refuses to run for one user. This is the hidden cost of custom spreadsheets. They appear to be free tools built by colleagues, but they become orphaned liabilities the moment those colleagues move on. The intern is not the problem. The problem is that the organization built a critical workflow on a single Excel file with no maintainer, no documentation, and no way to transfer institutional knowledge.
This story matters because it is not rare. Every large company has a version of this file. Some call it the "pricing model." Others call it the "capacity planner" or the "design calculator." They all share the same vulnerability: a single macro, a single reference library, a single version of a DLL that was installed on one person's machine years ago. When that macro breaks, work stops. The intern's project is halted. A multinational corporation's productivity depends on a file that was never designed to be shared, maintained, or scaled.
The lesson is practical and direct. If your organization relies on a macro-enabled spreadsheet that only certain people can run, you are one employee departure away from a stalled project. The solution is not to train every intern in VBA debugging. The solution is to move these workflows into tools that separate the logic from the file, tools that do not break because a system registry key is different or a reference path is missing. The intern deserves a calculator that works on the first try, not a ticket that goes unanswered. The organization deserves a system that does not require the original author to be present.