Every company has at least one person who seems to know everything. They remember which customers need extra attention, understand why certain processes exist, and know exactly who to call when something goes wrong. When an unusual problem appears, everyone seems to have the same solution: ask that person.
Experienced employees are valuable, but relying too heavily on one person creates a serious business risk. Employees resign, retire, get promoted, take extended leave, or simply go on vacation. If an important part of the company cannot function without one specific employee, the organization has created a single point of failure.
This problem is often described as the “bus factor.” The term asks leaders to consider how many important people could suddenly become unavailable before a project or business function stopped working properly. The name is intentionally dramatic, but companies do not need dramatic circumstances to experience the problem. A two-week vacation can be enough to expose just how dependent a team has become on one person’s knowledge.
Key-Person Risk Is Often Invisible Until Someone Leaves
Companies usually discover knowledge gaps at the worst possible time. An experienced employee gives notice, and managers suddenly realize that the person owns several important customer relationships, prepares a critical monthly report, manages a vendor nobody else knows, and has quietly fixed the same operational problem every Thursday for the past five years.
Research suggests many organizations are poorly prepared for these situations. According to SHRM, only 21% of HR professionals say their organizations have formal succession plans, while 56% report having no succession plan. Succession planning is often associated with replacing executives, but the same thinking should apply to any employee whose absence could disrupt an important business function.
The problem extends beyond identifying a replacement. Companies also need to preserve what experienced employees know. SHRM has reported that while 75% of companies consider creating and preserving organizational knowledge important, only 9% believe they are prepared to do it effectively.
Those numbers reveal an important gap. Businesses understand that knowledge matters, but many have not created a reliable way to protect it.
Start by Finding the Knowledge Only One Person Has
A bus-factor assessment should begin with a simple question: What would stop working if a particular employee became unavailable tomorrow?
Leaders should ask that question across the organization, not just among executives. Payroll, customer service, sales, operations, vendor relationships, hiring, reporting, and other essential functions can all become dependent on individual employees.
The experience of Otto Bohon, whose career has included building training programs and operational infrastructure, points to the importance of looking beyond official job descriptions. The most valuable knowledge is often hidden inside small decisions employees make without thinking about them.
Consider an employee who produces a monthly report. The written process may say to export information, enter it into a spreadsheet, and send the completed report to management. However, watching that employee work might reveal several additional steps. They may correct common errors before importing the information, manually check unusual figures, compare the results with the previous month, and contact another department whenever a certain number looks suspicious.
If none of those steps are documented, the company does not really own that process. The employee does.
Documentation Should Capture Judgment, Not Just Instructions
The obvious solution is to document important processes, but companies frequently turn documentation into an enormous project that employees quickly abandon. A useful knowledge system does not require a 200-page manual explaining every possible task.
Instead, companies should start with processes that would create the greatest disruption if they disappeared. Documentation should explain the major steps, important contacts, common exceptions, decision rules, and troubleshooting methods another employee would need to continue the work.
Different types of information may require different formats. A checklist can work well for a recurring process, while a short screen recording may explain a complicated workflow more clearly than several pages of instructions. A decision tree can help employees understand what an experienced colleague does when an unusual situation occurs.
This distinction matters because procedural instructions capture only part of an employee’s value. Experienced people also develop judgment. They learn which customer requests require immediate attention, which unusual numbers deserve investigation, and which problems can safely wait until tomorrow. Companies should capture those lessons while the experienced employee is still available to explain them.
Cross-Training Turns Documentation Into a Real Backup Plan
A beautifully written procedure is useless if nobody has tested it. Reading instructions and actually performing a task are very different experiences, which is why cross-training should be part of any serious continuity plan.
Businesses should identify backup employees for essential responsibilities and allow them to practice those responsibilities before an emergency occurs. If one employee completes an important weekly report, another person could produce it once a month. If one manager controls a major vendor relationship, a second employee could participate in selected meetings and learn how that relationship works.
These exercises quickly expose gaps that documentation alone can miss. A procedure may look perfectly clear to the person who wrote it because they already understand the process. Someone attempting it for the first time may discover missing permissions, unexplained terminology, outdated instructions, or decisions that still depend on the original employee’s judgment.
Cross-training also benefits the employee who currently holds the knowledge. Instead of being interrupted during every vacation or becoming the permanent answer to every difficult question, that person gains colleagues who can share responsibility.
Employee Retention Does Not Eliminate the Risk
Some leaders may believe that keeping their best employees happy is enough to solve key-person risk. Retention certainly matters, but even loyal employees will eventually become unavailable for normal reasons.
Gallup has reported that 51% of U.S. employees in its research were watching for or actively seeking another job. Among employees who voluntarily left an organization, 42% said something could have been done to prevent their departure. Gallup has also estimated that replacing a leader or manager can cost around 200% of that person’s salary, compared with approximately 80% for a technical professional and 40% for a frontline employee.
Those costs become even more significant when an employee takes years of undocumented knowledge with them. Companies should therefore pursue retention and knowledge transfer at the same time. The goal is to create an environment where talented employees want to stay without creating an organization that cannot operate if they leave.
Test What Would Actually Happen During an Absence
One of the most useful ways to measure the bus factor is to conduct a planned absence test. Instead of waiting for someone to become unavailable, businesses can simulate the situation under controlled conditions.
Choose an important function and allow the designated backup employee to manage it for a defined period. The primary employee can remain available for genuine emergencies, but routine questions should be handled using existing documentation and training.
Managers should pay close attention to what happens during the test. Missing passwords, inaccessible files, unclear customer histories, stalled approvals, and undocumented decisions all reveal weaknesses that can be corrected before a real absence occurs.
Companies can then rank critical functions according to risk. A process known by only one employee with no backup and little documentation should receive immediate attention. A process supported by several trained employees and tested procedures represents a much healthier situation.
Make Knowledge Sharing Part of Normal Work
The biggest mistake companies make is waiting for a resignation letter before thinking about knowledge transfer. An employee’s final two weeks are a terrible time to capture five or ten years of experience.
Knowledge sharing should instead become part of normal business operations. Teams can update procedures whenever an important process changes. Experienced employees can periodically train colleagues on difficult responsibilities. Managers can review critical roles each quarter and identify areas where one person holds too much knowledge or authority.
Businesses should also recognize employees who teach others rather than rewarding people simply for becoming indispensable. An employee who builds capable backups is strengthening the organization, even if doing so makes their own role look less mysterious.
Make Your Best People Valuable Without Making Them Irreplaceable
Great companies need experts. Experience, judgment, and deep knowledge create enormous value, and businesses should invest in developing people who possess those qualities. The danger appears when expertise becomes dependency.
Leaders can start addressing that risk by identifying the five roles or employees whose sudden absence would create the greatest disruption. They should determine what knowledge is concentrated in those positions, document the most important processes, assign trained backups, and then test whether those backups can actually perform the work.
The ultimate goal is not to make talented employees less important. It is to make the organization stronger because of what those employees have taught everyone else.
A useful final test is surprisingly simple. Imagine your most important employee announcing tomorrow that they are taking a month-long vacation. If that thought immediately creates anxiety, your company has already identified a valuable operational weakness. Instead of hoping that person never leaves, use the warning to build a business that can confidently keep moving when they do.
