SECI Model

Definition

A four-mode framework for how knowledge converts between tacit and explicit forms inside an organization. SECI = Socialization · Externalization · Combination · Internalization. Often visualized as a continuous spiral rather than a static 2×2.

The matrix

                       To Tacit                 To Explicit
                  ┌─────────────────────┬─────────────────────┐
   From   Tacit   │   Socialization     │   Externalization   │
                  │  (T → T, sharing    │  (T → E, articulate │
                  │   through practice) │   the unspoken)     │
                  ├─────────────────────┼─────────────────────┤
       Explicit   │   Internalization   │     Combination     │
                  │  (E → T, "learn it  │  (E → E, synthesize │
                  │   till it's gut")   │   existing docs)    │
                  └─────────────────────┴─────────────────────┘

The four modes

Mode	Direction	Mechanism	NOTQIN example
Socialization	Tacit → Tacit	Shared experience, apprenticeship	Oussama shadowing a real Moroccan OT engineer on-site
Externalization	Tacit → Explicit	Metaphors, dialogue, modeling	Operator explains why the press is about to jam → captured as a NOTQIN Pilot Playbook heuristic
Combination	Explicit → Explicit	Synthesis, documentation, classification	Writing the NOTQIN Industrial Intelligence Operating Thesis 2026 from 8 source documents
Internalization	Explicit → Tacit	Learning by doing, study	Reading the Thesis until the 5-layer model becomes intuition

Why it matters

Healthy KMS = all four loops running continuously. Most KM systems fail because they only execute one or two modes:

• Pure Combination → endless synthesis from existing docs, no new tacit input → the system inbreeds
• Pure Socialization → tacit knowledge stays in heads → org loses capability on resignation
• No Internalization → docs nobody reads → 200-page binders that don’t change behavior

The spiral

Nonaka’s central insight: knowledge creation is a spiral — each cycle through the four modes operates at a higher level. Tacit insights from operators (Externalization) get synthesized into formal models (Combination), absorbed by new hires (Internalization), who develop new tacit intuitions through practice (Socialization), which seeds the next round of Externalization.

How NOTQIN’s onboarding runs all four

Activity	Mode
Team kick-off call + shadowing Ahmed’s discovery calls	Socialization
19-question feedback form	Externalization
Ahmed rewriting Path-to-Pilot after the Alignment Meeting	Combination
Reading the Thesis + concept notes for 2 weeks	Internalization

You’re running a full SECI spiral in 14 days. Most orgs achieve this in 14 months.

Common mistakes

• Drawing the matrix and calling it done. The model is a process diagnostic, not a chart
• Skipping Internalization (“we wrote it down, so people know it now”)
• Skipping Externalization because it’s awkward (people don’t like being asked to articulate intuition)
• Treating Combination as the “real” KM work — it’s the easiest mode and the lowest-value if isolated

See also

• Tacit vs Explicit Knowledge — the input ontology
• KM Lifecycle — the operational complement
• Communities of Practice — primary Socialization venue
• After-Action Reviews — structured Externalization
• Knowledge Management Systems — Foundations