Interaction Design: 7 Principles for Experiences You Feel

Why Interaction Design Changes Everything

An interface can be technically perfect yet feel cold, opaque, hostile. An installation can work with three lines of code and leave a lasting memory. The difference isn't in the amount of code: it's in the attention paid to the experience.

Interaction design (IxD) is the discipline that designs the behaviour of interactive systems — how they respond, how they communicate their state, how they guide without imposing.

The 7 Principles

1. Affordance

Affordance is the direct perception of how to use something. A handle is grabbed. A button is pressed. Digitally: something that looks like a button must behave like one. Golden rule: never force the user to guess.

2. Immediate Feedback

Every action must produce a perceptible response in < 100ms. Beyond that, the user doubts they acted. Feedback can be visual (animation), audio (beep, click), or haptic (vibration). Absence of feedback is a design error.

3. Continuity

Transitions between states must be smooth. An object shouldn't appear/disappear abruptly — it enters, exits, transforms. Easing (acceleration/deceleration) makes movement feel natural.

4. Constraint

Limit possible actions to those that make sense in context. A well-designed constraint isn't a restriction: it's a guide. It reduces cognitive load and prevents errors.

5. Consistency

The same gestures produce the same effects everywhere in the experience. Swipe down = scroll. Pinch = zoom. Breaking consistency creates confusion, even unconscious.

6. State Visibility

The user must always know where they are: loading, action succeeded, error, end of experience. State visibility is the breadcrumb trail that prevents getting lost.

7. Error Tolerance

Anticipate that users will make mistakes — and make errors recoverable. "Undo" is one of the most important functions of an interface. In installations: an error must never block the experience for the next visitor.

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