4-Dialog - Dialog design Dialog styles Question and answer...

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2/2/10 1 Dialog design Dialog styles: Question and answer Form fill in Command language Natural language Menu selection Direct manipulation Important issues Initiative who has control? Training requirements (to understand concepts) Learning time (to become proficient) Speed of use (once proficiency is achieved) Dialog design Important issues Generality / flexibility / power Ability to show current / default values Typing skill requirements Question and answer example Use "back" to back up and re-answer previous question. Use "stop" to stop the questionlng. what is your marital status? (m = married, s = single) >s how many dependents do you have? >2 give the first dependent's first name. >james give the second dependent's first name. >anne Dialog design Question and answer example Ready for command > create What file name? > 2007 budgets Do you want password protection? > yes What password? > ********** Dialog design Question & answer -pros & cons (+= pro; - = con; ?= ?) + little training needed + oriented toward naive users + default or current values can be shown + alternative answers can be indicated - slow for experienced users - slow on system with poor response time - best for use when answers are constrained or predictable - usually requires typing skill - user does not have context of knowing what question will be asked - difficult to use in a complex environment ? Guides user but system in control + good with many branch points Dialog design Question and answer guidelines give proper syntax to be used in answering show all possible answers if specific codings are required for example: s = single, m= married provide defaults if they make sense provide escape to correct earlier answer, and to abort Dialog design Form fill in pros & cons + little training needed + fast throughput, especially if defaults shown + user sees "big picture" context + default or current selection/value can be shown + more user initiative than question and answer - computer initiated - hard to indicate a large set of alternatives - limited power ? Can't adapt single form based on value entered into one field (can use succession of forms) ? Oriented toward data entry as opposed to commands
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2/2/10 2 Dialog design Form fill in - guidelines make form look like paper equivalent, if one exists distinguish between optional and required entries display default values distinguish between default values and those explicitly entered by the user explicitly show minimum and/or maximum length require a single keystroke or selection to move from one field to the next vertically align fields - it looks neater do not require user to left or right justify entry do not force user to put in spaces or required text (e.g., ( ) or - in phone #) Dialog design Command language - example Create a pie chart pie 3 values 5, 10, 15 font modern size 18 color yellow title 'pie chart demo' slice 1; green break slice 2; yellow slice 3; red Create a file create 2003budgets, size = 10 pw = secret Dialog design
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