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much but they must be consistent If we ever detect silence, we know that we have failed to press the key The true value of positive audible feedback is that its absence is an extremely effective problem indicator The effectiveness of positive audible feedback originates in human sensitivity Nobody likes to be told that they have failed Error message boxes are negative feedback, telling the user that he has done something wrong Silence can ensure that the user knows this without actually being told of the failure It is remarkably effective, because the software doesn t have to insult the user to accomplish its ends Our software should give us constant, small, audible cues just like our keyboards Our applications would be much friendlier and easier to use if they issued barely audible but easily identifiable sounds when user actions are correct.

*A:Router1# admin set-time - set-time <date> <time> <date> <time> : YYYY/MM/DD : hh:mm[:ss]

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The program could issue a reassuring click every time the user enters valid input to a field, and an affirming tone when a form has been successfully completed If an application doesn t understand some input, it should remain silent, subtly informing the user of the problem, allowing her to correct the input without embarrassment or ego-bruising Whenever a user starts to drag an icon, the computer could issue a low-volume sound reminiscent of sliding as the object is dragged When it is dragged over pliant areas, an additional percussive tap could indicate this collision When the user finally releases the mouse button, he is rewarded with a soft, cheerful plonk from the speakers for a success or with silence if the drop was not meaningful As with visual feedback, computer games tend to excel at positive audio feedback.

notice that after displaying some help (the list of available options), the CLI re-typed your original command to leave you exactly where you were before typing the . 4. We all make mistakes from time to time. It s easy to interrupt or cancel at any time whatever has been typed: type [Ctrl]+C to kill everything that has been typed on the line.

Mac OS X also does a good job with subtle positive audio feedback for activities like document saves and drag and drop Of course, the audible feedback must be at the right volume for the situation Windows and the Mac offer a standard volume control, so one obstacle to beneficial audible feedback has been overcome, but audible feedback should also not overpower music playing on the computer Rich modeless feedback is one of the greatest tools at the disposal of interaction designers Replacing annoying, useless dialogs with subtle and powerful modeless communication can make the difference between a program users will despise and one they will love Think of all the ways you might improve your own applications with RVMF and other mechanisms of modeless feedback!.

*A:Router1# admin set-time ^C *A:Router1#

The application developer describes a target network as an instance of the Deployment model. The structure of the Deployment model is shown in Figure 4.4. The description of the target deployment can be separated into network-level parameters and node-level parameters. Examples of networklevel parameters include: number of nodes, radio range (assuming all nodes have a fixed radio range), the real or virtual X and Y coordinate range of the localization system, etc.

As we discussed in Part I, personas and scenarios help us focus our design efforts on the goals, behaviors, needs, and mental models of real users. In addition to the specific focus that personas can give a design effort, there are some consistent and generalizable patterns of user needs that should inform the way our products are designed. In this chapter, we ll explore some strategies for serving these well-known needs.

5. It s easy to forget the exact spelling of a command. The CLI has help for this situation also: Type the word admin and only a part of set-time, and then press the [Space] or [Tab] key to have the system auto-complete the command.

Two concepts are particularly useful in sorting out the needs of users with different levels of experience: Command vectors and working sets. Command vectors are distinct techniques for allowing users to issue instructions to the program. Direct manipulation handles, drop-down and pop-up menus, toolbar controls, and keyboard accelerators are all examples of command vectors. Good user interfaces provide multiple command vectors, where critical application functions are provided in the form of menu commands, toolbar commands, keyboard accelerators, and direct manipulation controls, each with the parallel capability to invoke a particular command. This redundancy enables users of

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