Correctness

An UI is "wrong" if..

Specification

Formal languages

State machines

Finite State Machine (FSM)

Central tension

Problems with FSM

Formalized descriptions

Non-formal languages

Semi-formal languages

User Centred Design (UCD)

UCD principles

Scenarios

Functions prioritization

Usage patterns

Designing the UI

UI attributes

Component distribution: Temporal

Component distribution: Spatial

Storyboards

Interaction Sequences

Interface Schematics

Visual vocabulary

Prototypes

Prototype fidelity

Low fidelity prototype

High fidelity prototype

Paper prototyping

Wizard-of-Oz Technique (WoZ)