Knowledge Representation & Mental Models

internal representation of how a system works

concrete

Simulated

Constructed from experience

Incomplete

Transferred from mental models of smilair objects

Norman

Designers Model

User model

System Image

Examples

Tap

Designers model has 2 seperate water supplies mixed

users model: water coming out, temperature, pressure

Declarative

Know that: concepts, relationships, things & actions

Procedural

Processes, procedures

Means-end reasoning

Unconcious

typing, driving etc

Imageability supports remembering and reasoning

Pin number

Either can be representated graphically or textually

e.g on a map.The museum is located here: DecalrativeTo get there you need to take a right..go up 3 blocks, next left then its on the corner: Procedural

Knowledge in Head vs World

Retrievability, Learning, Efficieny of use, ease of use at first encounter, Aesthetics