Understanding how people interact with systems involves distinguishing between different types of knowledge and mental models. Knowledge can be divided into declarative and procedural types.
Retrievability, Learning, Efficieny of use, ease of use at first encounter, Aesthetics
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
Imageability supports remembering and reasoning
Pin number
Procedural
Unconcious
typing, driving etc
Means-end reasoning
Processes, procedures
Declarative
Know that: concepts, relationships, things & actions
Examples
Tap
users model: water coming out, temperature, pressure
Designers model has 2 seperate water supplies mixed
