Combination is the SECI knowledge-management phase in which explicit knowledge is gathered, reorganized, and integrated into a new usable form. The input is already written or structured, such as reports, logs, procedures, indicators of compromise, or policy documents. The value of this phase comes from recombining separate records into something easier to search, compare, and act on.
In cyber security, combination matters because defenders constantly merge evidence from multiple sources: SIEM alerts, endpoint telemetry, threat-intelligence feeds, asset inventories, and incident tickets. When done well, it supports better detection, triage, and response by turning scattered facts into operational insight. Attackers also use a similar idea when they combine leaked data, public records, and internal documentation to build phishing lures or map a target’s environment. Good controls such as data classification, provenance tracking, and access restrictions help ensure that combination improves security instead of spreading sensitive information.