Let's continue on Usability Engineering !
Usability Metrics is how to measure the quality of a product, it should be efficient, effective and satisfying.
Efficient is once users have learned the design, how quickly can they perform tasks?
Effectiveness is the degree to which something is successful in producing a desired result; success.
Satisfaction - how pleasant is it to use the design?
Learnability - easy to learn easy to play.
Errors is the key point, when user want to perform action but output is not as expected, its due to misunderstanding of system. A few error is made work successful.
Time is another class can measure of efficiency like how long it takes to perform the task.
I have to research more on the advantages and disadvantages of Usability engineering.
Benefits of Usability
User Effectiveness
Increase success rate and reduce users errors
Improve ease of use and ease of learning
Increase user productivity and user satisfaction
Increase user trust in the system
Reduce support costs and training costs
Development Costs
Reduce development costs and time
Reduce maintenance costs
Revenue
Increase product sales, revenue and market share
Increase site traffic and transactions/purchases
Attract and retain more customers
Lack of Usability
Although the definition of usability may be the subject of some discussion, lack of usability is readily recognizable. Systems that lack usability are characterized by:
1.Existence of workarounds - because the interface is difficult or does not match workflow in the real world, users develop workarounds to compensate for the inadequacies of the system
2.Low usage levels - Users use the system as little as possible.
3.Dissatisfaction - Users, and particularly novices, will find the system difficult or frustrating to use 4.Rework or double-handling - Inefficient design often means that the same data may need to be entered or read more often than is necessary.
Because incorporating usability is a quality activity, it often occurs that systems with poor usability are also deficient in other areas. For example, they are likely to be crash-prone, poorly documented and difficult to maintain.
Thanks for today!
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