IMSE_CIS577_Lec3_2.ppt - IMSE/CIS577- User Interface Design...

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Lecture 3-2: The Interaction IMSE/CIS577- User Interface Design & Analysis Winter 2011 1-2 The Interaction interaction models translations between user and system ergonomics physical characteristics of interaction interaction styles the nature of user/system dialog context social, organizational, motivational 2-2 1-3 What is interaction? communication user system but is that all ! ? see “language and action” in chapter 4 ! 2-3 1-4 models of interaction terms of interaction Norman model interaction framework 4
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1-5 Some terms of interaction domain – the area of work under study e.g. graphic design goal – what you want to achieve e.g. create a solid red triangle task – how you go about doing it – ultimately in terms of operations or actions e.g. ! select fill tool, click over triangle Note ! traditional interaction ! use of terms differs a lot especially task/goal !!! 2-5 1-6 Donald Norman’s model Seven stages user establishes the goal formulates intention specifies actions at interface executes action perceives system state interprets system state evaluates system state with respect to goal Norman’s model concentrates on user’s view of the interface 2-6 1-7 execution/evaluation loop user establishes the goal formulates intention specifies actions at interface executes action perceives system state interprets system state evaluates system state with respect to goal system evaluation execution goal 2-7 1-8 execution/evaluation loop user establishes the goal formulates intention specifies actions at interface executes action perceives system state interprets system state evaluates system state with respect to goal system evaluation execution goal 2-8
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1-9 execution/evaluation loop user establishes the goal formulates intention specifies actions at interface executes action perceives system state interprets system state evaluates system state with respect to goal system evaluation execution goal 2-9 1-10 execution/evaluation loop user establishes the goal formulates intention specifies actions at interface executes action perceives system state interprets system state evaluates system state with respect to goal system evaluation execution goal 2-10 1-11 Using Norman’s model Some systems are harder to use than others Gulf of Execution user’s formulation of actions " actions allowed by the system Gulf of Evaluation user’s expectation of changed system state " actual presentation of this state 2-11 1-12 Human error - slips and mistakes slip understand system and goal correct formulation of action incorrect action mistake may not even have right goal!
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IMSE_CIS577_Lec3_2.ppt - IMSE/CIS577- User Interface Design...

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