what is usability

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WHAT IS USABILITY / UXWhat the rest of the industry is doing

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Usability!

• What is that?• A Requirement• A set of Activities• A Test• A Discipline• A Process• A Repeatable Process

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Usability: What is That?

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Usability as a Requirement(ISO Usability Standard 9241 )

• Usability is how a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context

– Effectiveness measures accuracy and completeness– Efficiency measures resources expended – Satisfaction measures the freedom from discomfort, and positive attitudes towards the

use of the product

=

Effectiveness (% of goal achieved)+ Efficiency (time to complete a task, or the error rate, or the amount of effort)+ Satisfaction (subjective rating scale)

Usability

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Usability as a Set of Activities

47 Usability Patterns• Heuristic Evaluation• Wireflow• Participatory Design• Concept Model• Ecosystem Visualization• Five Whys• Facets• Page Description Diagram• Design Pattern• Rapid Facilitation• Sketchboard• Collaborative Inspection• Usability Capture Software• Backcasting• Service Design

• Taxonomy• Ethnography• Personas• Scenario Planning• Tagging• User Scenario• A/B Testing• Affinity Diagram• Alignment Model• Conversation Sketching• Diary Study• Experience Map• Free Listing• Kano Analysis• Paper Prototype• Six Thinking Hats

• Task Analysis• Process Flow• Wireframe• Site Map• Swimlanes• Web Analytics• Card Sort• Concept Video• Search Analytics• Usability Testing• GOMS• Tangible Futures• Design the Box• Digital Ethnography• Five Sketches™• Controlled Vocabulary

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How do you Measure/Test Usability?

Effectiveness• Percent of tasks

completed• Ratio of successes to

failures• Workload• Number of features or

commands used

Efficiency • Time

• Complete a task

• Learn a task

• Spend on errors

• Percent or number • Errors

• Failed commands

• Tasks completed

• Frequency of help or documentation use

Satisfaction• Rating scale

• Usefulness of product/service

• Functions/features

• User vs. technological control of task

• Number of times user expresses frustration or anger

• Perception that the technology supports tasks as needed by the user

What are some examples at SCE?

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Usability is Complex and Interdisciplinary

Usability/UX

Architecture

Industrial Design

Electrical Engineering

Mechanical Engineering

Information Architecture

Visual Design Interaction Design

Human Computer Interaction

Ubiquitous Computing

Controls

Interactive Environments

Usability Engineering

Interface Design

Navigation

Signage

Information Visualization

Content Creation

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If You Thought That Was Bad!

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A Process For Usability

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Usability as a Repeatable Process