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Chapter 16 Why evaluate usability of UI designs (6 Terminology (Evaluation…
Chapter 16 Why evaluate usability of UI designs
6
Terminology
Evaluation Data
:check: Information obtained
:check: Types of data
:!: Comments
:!: Notes
:!: Audio & Video Recordings
Evaluator
:check: Plans an evaluation, analyses the data, and reports the findings
Participant
:check: The person who interacts with or inspects the UI to give feedback
:check: Need not be a user of the UI
:check: Subject of the test
Observer
:check: Observer and make notes of the participant's comments and problems
Usability evaluation
:check: Complete test of the UI
:check: Consists of one or more evaluations meetings
Facilitator
:check:: Manage the evaluation
:star: explains the aims of evaluation and described
:check: Answers queries participant
Evaluation helps
:warning: To understand the user experience with the system
:warning:Improve the difficulties
User interact with a computer system through the UI
5E's Purpose of Evaluation
Engaging
:!: Degree which tone and style of UI makes the product pleasant or satisfying to use
Error tolerant
:!: How well design prevents errors or helps with recovery from those that do occur
Efficient
:!: Speed with which users complete tasks
Easy to learn
:!: Supports both initial orientation and deepening understanding of its capabilities
Effective
:!: Completeness and accuracy with which user achieve their goals
Activities of Usability Evaluation
Evaluation strategy
What you want to achieve by conducting the evaluation session(s) and constraints you have ( time,money)
Evaluation Plan
Generated from evaluation, on how and when evaluation session(s) are conducted
Assumptions
Evaluation using a single technique
Overall purpose to incorporate feedback into UI design
Definition of usability requirements available
Data analyzed and interpreted
:warning: Analysis :
:!: Process of collating and summarising the data collected
:!: Identify any usability problems
:warning: Interpretation
:!: Involves find the causes of the usability problems, creating a set of recommendation
:warning: Documenting results of recommendation in an evaluation report
:warning: Conducted silmultaneously
Techniques
:check: Systematic way of conducting an evaluation session
:warning: Heuristic inspection or inspection