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Working theory 1 of 6 · revised October 16, 2026

What, exactly, is an interaction?

What I think right now

An interaction is not an event on a component. It is a relationship that changes state on both sides: the person, the system, and what passes between them. Human-computer interaction kept widening that definition for forty years without settling it, and the honest version of the field admits it is still open.

What would change my mind

A model of interaction that predicts behavior in interfaces nobody designed it for, without adding a new category each time it meets one.

Loose ends

  • Where agency sits when a system acts between two people.
  • Whether a relationship can be measured without being reduced to an event.

The trail

  1. Essay Why Interaction Became a Scientific Problem Four decades of human-computer interaction, and the question the field kept postponing: what, exactly, is an interaction?
  2. System Fundamental Engine A shared relational field represents bodies, relationships, constraints, and feedback; host adapters connect that model to interfaces and other surfaces.

Think I have this wrong? That is the most useful thing you could tell me.

Disagree with me