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Heuristic evaluation

Heuristic evaluation
1. How to conduct heuristic evaluation
Heuristic evaluation is performed by having each individual evaluator inspect the
interface alone. Only after all evaluations have been completed are the evaluators
allowed to communicate and have their findings aggregated. This procedure is
important in order to ensure independent and unbiased evaluations from each
Know what to test and how
Whether it’s the entire product or one procedure, clearly define the parameters of what
to test and the objective.
Select 3–5 evaluators
Ensuring their expertise in usability and the relevant industry.
Heuristic evaluation
ProblemsFound( i ) = N(1 - (1-l) i )
ProblemsFound( i ): number of different usability problems
i: number of evaluators
N: total number of usability problems
l: proportion of all usability problems found by a single evaluator (34%)
Know your users and have clear definitions of the
target audience’s goals, contexts, etc
User persona
User stories
Business goals
1st Walkthrough
Have evaluators use the product freely so they can identify elements to analyze.
2nd Walkthrough
Evaluators scrutinize individual elements according to the heuristics. They also
examine how these fit into the overall design, clearly recording all issues encountered.
Debriefing session
Prioritize usability issues, and brainstorm solutions
2. Checklist of criteria
Visibility of system status
Heuristic evaluation
The system should keep users informed through appropriate feedback within
reasonable time
Match between system and the real world
The system should speak the users' language rather than system-oriented terms.
Follow real-world conventions
User control and freedom
Users often make mistakes and need 'emergency exits' to leave the unwanted state.
Support undo and redo
Consistency and standards
Users shouldn't have to wonder whether different words, situations, or actions mean the
same thing. Follow platform conventions
Error prevention
Prevent problems from occuring in the first place, or check for them and present users
with a confirmation option before they commit to the action
Recognition rather than recall
Minimize memory load by making objects, actions, and options visible. Instructions
should be visible or easily retrievable
Flexibility and efficiency of use
Accelerators - unseen by the novice user - may often speed up the interaction for the
expert user. Allow users to tailor frequent actions
Aesthetic and minimalist design
Dialogues should not contain information which is irrelevant or rarely needed
Help recognize & recover from errors
Heuristic evaluation
Error messages should be expressed in plain language, indicate the problem, and
suggest a solution
Help and documentation
Any necessary help documentation should be easy to search, focused on the user's
task, list concrete steps to be carried out, and not be too
Heuristic evaluation