CONCEPT
Knowing-in-Action
Schon's name for the tacit knowledge embedded in skilled performance itself — competence that cannot be separated from the doing, that exists as performance rather than cognition.
Knowing-in-action is the foundation beneath reflection-in-action. Where reflection-in-action names the practitioner's capacity to adjust mid-performance, knowing-in-action names the vast substrate of embodied, practiced competence that makes the adjusting possible. The potter centers the clay through a sensory-motor coordination she cannot articulate. The experienced developer feels that an architecture will not scale before she can explain why. The master teacher detects that a student has stopped understanding from a shift in posture no camera would flag. These are not preliminary forms of articulable knowledge. They are a different kind of knowing — Michael Polanyi's tacit dimension operationalized as professional competence. AI can reproduce what can be articulated. Knowing-in-action is what it structurally cannot reach.
In The You On AI Field Guide
The philosophical foundation for knowing-in-action predates Schon by decades. Michael Polanyi's The Tacit Dimension (1966) articulated the claim that "we know more than we can tell," and that the most important knowledge — the knowledge that makes skilled performance possible — resists full articulation not as a practical