Usability Evaluation
Usability refers to the quality of a user's experience when interacting with products or systems, including websites, software, devices, or applications. Usability is about effectiveness, efficiency and the overall satisfaction of the user.
It is important to realize that usability is not a single, one-dimensional property of a product, system, or user interface. ‘Usability’ is a combination of factors including:
- Intuitive design: a nearly effortless understanding of the architecture and navigation of the site
- Ease of learning: how fast a user who has never seen the user interface before can accomplish basic tasks
- Efficiency of use: How fast an experienced user can accomplish tasks
- Memorability: after visiting the site, if a user can remember enough to use it effectively in future visits
- Error frequency and severity: how often users make errors while using the system, how serious the errors are, and how users recover from the errors
- Subjective satisfaction: If the user likes using the system
Especially the last one, subjective satisfaction, is too difficult to measure the level. Because it is literally subjective. And, the level of satisfaction is always changed by people, environment and all the things around of us. The most confusing thing is users cannot perceive how and where it occurs. So they couldn't tell us the answer.
THEN,
HOW TO MEASURE SATISFACTION
IN USABILITY TEST
Measuring satisfaction
_Satisfaction questionnaires
SUS - System Usability Scale
The SUS (PDF) is a simple survey of Likert scales. The creator, John Brooke, intended the SUS to be a quick and dirty benchmark of software usability. However, the ten standard questions can be modified for websites, and studies (PDF) have shown that the SUS is a highly reliable method of devising a significantly unique score for a site.
The SUS (PDF) is a simple survey of Likert scales. The creator, John Brooke, intended the SUS to be a quick and dirty benchmark of software usability. However, the ten standard questions can be modified for websites, and studies (PDF) have shown that the SUS is a highly reliable method of devising a significantly unique score for a site.
System Usability Scale (SUS) Organization: UsabilityNet.orgURL: http://www.usabilitynet.org/trump/documents/Suschapt.doc 
WAMMI - Website analysis and measurement inventory
WAMMI is a paid user survey service that gives your site a score based against a database of hundreds of other sites that have used the same survey. The WAMMI questions are online and are a useful starting point for building your own survey questions. If you build your own, you won't have access to the database, but you can use your results to benchmark against iterations or site improvements.
WAMMI is a paid user survey service that gives your site a score based against a database of hundreds of other sites that have used the same survey. The WAMMI questions are online and are a useful starting point for building your own survey questions. If you build your own, you won't have access to the database, but you can use your results to benchmark against iterations or site improvements.
SUMI - Software usability measurement inventory
SUMI differs from the previous surveys in that it's 50 questions long. Instead of rating items on a 5-10 point Likert scale, users simply agree or disagree with a statement. The benefit to this approach is that respondents don't have to think about quantifying the degree of their opinion; SUMI makes up for the lack of detail in individual answers by asking lots of questions. The SUMI questionnaire is also a very useful starting point for writing your own custom survey. Like WAMMI, SUMI is a paid-for service.
SUMI differs from the previous surveys in that it's 50 questions long. Instead of rating items on a 5-10 point Likert scale, users simply agree or disagree with a statement. The benefit to this approach is that respondents don't have to think about quantifying the degree of their opinion; SUMI makes up for the lack of detail in individual answers by asking lots of questions. The SUMI questionnaire is also a very useful starting point for writing your own custom survey. Like WAMMI, SUMI is a paid-for service.
http://sumi.ucc.ie/whatis.html (What is SUMI?)
These three survey approaches have been around for a long time. They are highly practical questionnaires originally designed to deliver usability ratings for software systems. Because they come from a time when software was classically horrible to use, the bones of these surveys are well-suited to get at definition-a satisfaction. There are some other old-school usability indexes such as QUIS, USE, or CSUQ that can be examined as well.
SOURCES
http://www.peakusability.com.au/articles/measuring_satisfactionhttp://www.usabilitynet.org/trump/methods/satisfaction.htm
http://www.usability.gov/what-and-why/usability-evaluation.html
(another sources in body)
http://www.intuitionhq.com/blog/2011/05/10-great-reasons-to-usability-test/
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