Tacit knowledge is expertise held by one person or a small group that has not been recorded in accessible documentation. When a team depends on one person to fill knowledge gaps, work can slow and the team may struggle to scale. section 5.1.2
Reduce reliance on undocumented expertise by spreading knowledge through the team:
- Document recurring problems and their resolutions so teammates can use them during on-call work and handovers. section 10.1.5
- Use code reviews to bring more people into decisions and share knowledge across the team. section 12.2.1
- Delegate work to give others opportunities to build expertise instead of becoming the sole knowledge bearer. section 5.1.2
Legacy services
A team maintaining two critical legacy services relied on tribal knowledge to make short-term fixes when production problems arose. Documentation, code-quality tools, and reviews helped the team share expertise and improve maintainability. section 12.2.1
