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Three Principles Of Direct Partipulation

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Zaid Naser fc4097 10/5/17 Homework #2 Describe three principles of direct manipulation. Answer First is the continuous representation of the objects. The actions of interest with meaningful visual metaphors. Second is physical actions of labeled buttons, instead of complex syntax. Third is rapid incremental reversible actions. Last is the effects on objects of interest is visible. An airline company is designing a new on-line reservation system. They want to add some direct-manipulation features. For example, they would like customers to click a map to specify the departure cities and the destinations, and to click on the calendar to indicate their schedules. From your point of view, list four benefits and four problems of the new idea compared with their old system, which required the customer to do the job by typing text. Answer One benefit is that encourage people to discover the place that they want to go. The second benefit is that a user might know where they are going on the map. The user might not know the name of the place. The third benefit is that it reduces the formatting you have to do in order to check the location and date input. The last benefit is that the users can see the prices at the same time that they pick their location. One problem is having too much information can prevent the users from seeing things. The user can pass things like special others and more. The second problem is that the user might choose the wrong time and date from the

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