A 2022 survey of a thousand IT managers, conducted by Sinequa, found that 67% were concerned about knowledge loss when people leave their company, and 64% said their organization had already experienced it. That's not a hypothetical risk most companies successfully avoid. It's the default condition, and it stays invisible until it isn't.
Most knowledge was never documentation
Ask where the important knowledge in a company actually lives, and the honest answer is rarely "our documentation." It's the pricing exception approved for one client, the real reason a feature got descoped two days before launch, the current process as actually practiced, distinct from what's still written in a doc from a year ago. None of it felt, in the moment, like something worth formally writing down.
Knowledge management research puts a number on how much of this exists: tacit knowledge, the kind that's never been codified anywhere, is commonly estimated at around 80% of an organization's total knowledge base, a figure widely cited across workplace knowledge research, though its precise origin has been repeated so often the citation trail gets fuzzy in most places that use it now.
The single point of failure
Knowledge that only exists in one person's head has exactly one failure mode: that person becoming unavailable. A vacation turns into a week of waiting. A departure turns it into something genuinely gone, rediscovered later the hard way, usually during a renewal conversation or an audit, exactly when it would have mattered most.
Why "document more" doesn't work
The instinctive response after the incident that exposes the gap is a resolution to document better. It rarely survives a busy week, because documentation competes directly with doing the work, and doing the work always wins. Nobody stops mid-resolution to write a clean page about the resolution for future reference.
A different way to think about the fix
The more durable answer isn't asking people to document more. It's capturing what already gets said, inside the tools people already use, without requiring anyone to pause and produce a separate version purely for posterity. The knowledge already exists, in the exchange itself. The problem was never that nobody knew things, it's that what's known lives nowhere searchable, and evaporates the moment the person holding it does too.
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