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31 Jul

Lecture 3:The Timely User Experience


SOLUTION AT Australian Expert Writers

Learning Outcomes
Models of System Response Time (SRT) Impacts
Expectations and Attitudes
User Productivity and Variability in SRT
Frustrating ExperiencesCRICOS 03171AIntroduction• With current computer, device, wireless andInternet technology, we have an increasedthirst and expectation for fast response time– Loading graphics, audio, video, images,animation, etc. all impact how quicklywe can do things in today’s societyCRICOS 03171AContinued: Lengthy or unexpected systemresponse time can produce:• Frustration• Annoyance• Eventual anger Speedy and quickly done work canresult in users:• Learning less• Reading with lower comprehension• Making more ill-considereddecisions• Committing more data-entry errorsCRICOS 03171ACRICOS 03171AIntroduction (concluded)• System Response Time (SRT) is a key topic and concern for network designers,wireless manufacturers, telecommunications providers, and others• There are steps interface designers can take to improve the timely user experience– Designers can optimize web pages – it helps to reduce the number of queriesand accesses to the network– Human reaction time is another factor– In practice, users seems to be bothered or not ???CRICOS 03171AOptimizing Design (example) The Earthdata Search (search.earthdata.-nasa.gov) indicates the geographic and temporalcoverage of datasets before thedata is downloaded. Here theuser has selected two datasetsCRICOS 03171AModels of SRT impacts• SRT definition:The number of seconds it takes fromthe moment users initiate an activityuntil the computer presentsresults on the display.• User think time:The number of seconds the user thinks beforeentering the next actionCRICOS 03171AModels of SRT impacts (continued)• Designers of response times and display rates in HCI must consider:– Cost– User expectations– Speed of task performance• Overall majority of users prefer rapid interactions– Lengthy response times (seconds) are detrimental to productivity– Rapid response times (1 second or less) are preferable, but can increase errors for complex tasksCRICOS 03171AExpectations and AttitudesCRICOS 03171AExpectations and Attitudes• Users may achieve rapid task performance, low error rates,and high satisfaction if the following criteria are met:– Users have adequate knowledge of the objects andactions necessary for the problem-solving task– The solution plan can be carried out without delays– Distractions are eliminatedCRICOS 03171AExpectations and Attitudes• Three primary factors that influence user expectations andattitudes regarding SRT are:
Previous experiences
Individual personality differences
Task differencesCRICOS 03171AExpectations and Attitudes (concluded)• These conjectures may play a role in choosing the optimum interactionspeed:– Novices may exhibit better performance with somewhat slowerresponse times.– When there is little penalty for an error, users prefer to work morequickly.– If users have experienced rapid performance previously, they will expectand demand it in future situations.CRICOS 03171AUser Productivity and Variability in SRT• Repetitive tasks• Problem solving tasks• People are willing to pay substantial amounts of money to reducethe variability in their lives, e. g. the insurance industryCRICOS 03171AUser Productivity and Variability in SRT (concluded)• Progress indicators reassure users thatthe process of uploading photos fromPicasa to the web is underway, andhow far it has gone already.• They also allow users to see the resultsor to cancel uploadsCRICOS 03171AFrustrating experiences• Since frustration, distractions, and interruptions can impede smoothprogress, design strategies should enable users to maintain concentration.• Three initial strategies can reduce user frustration 
Reduce short-term and working memory load
Provide information abundant interfaces
Increase automaticityCRICOS 03171AReducing User Frustration• Increase server capacity, network speed, and network reliability• Improve user training, online help, and online documentation includingtutorials• Redesign instructions and error messages• Increase research on user frustration• Catalyze public discussion to raise awarenessCRICOS 03171ASRT Guidelines• Users prefer shorter response times• Longer response times (> 15 seconds) are disruptive• Shorter response time leads to shorter user think time• A faster pace may increase productivity, but it may also increase errorrates• Response time should be appropriate to the taskCRICOS 03171ASRT Guidelines concluded:• Users should be advised of long delays• Modest variability in response time is acceptable• Unexpected delays may be disruptiveCRICOS 03171ASummarize the important points
What we have discussed in week 2 ? Summarize some points.
Which is the most likely topic for today’s class ?Can you explain why ?
Which is the least likely topic for today’s class ?Can you justify your opinion ?
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