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Figure 25-6 Every time we delete a file in Windows, we get this confirmation dialog box asking if we re sure. Yes, we re sure. We re always sure. And if we re wrong, we expect Windows to be able to recover the file for us. Windows lives up to that expectation with its Recycle Bin. So, why does it still issue the confirmation message When a confirmation box is issued routinely, users get used to approving it routinely. So, when it eventually reports an impending disaster to the user, he goes ahead and approves it anyway, because it is routine. Do your users a favor and never create another confirmation dialog box.

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Revealing the implementation model to users is a surefire way to create an unpleasant and inferior product. This means that confirmation messages are inappropriate. Confirmations get written into software when a programmer arrives at an impasse in her coding. Typically, she realizes that she is about to direct the program to take some bold action and feels unsure about taking responsibility for it. Sometimes the bold action is based on some condition the program detects, but more often it is based on a command the user issues. Typically, the confirmation will be launched after the user issues a command that is either irrecoverable or whose results might cause undue alarm. Confirmations pass the buck to users. Users trust the application to do its job, and the application should both do it and ensure that it does it right. The proper solution is to make the action easily reversible and provide enough modeless feedback so that users are not taken off-guard. As a program s code grows during development, programmers detect numerous situations where they don t feel that they can resolve issues adequately. Programmers will unilaterally insert buck-passing code in these places, almost without noticing it. This tendency needs to be closely watched, because programmers have been known to insert dialog boxes into the code even after the user-interface specification has been agreed upon. Programmers often don t consider confirmation dialogs to be part of the user interface, but they are.

Description : Default System Log Memory Log contents [size=500 next event=25 (not wrapped)] 24 2006/08/17 15:30:55.29 UTC WARNING: SYSTEM #2006 - CHASSIS tmnxMDATable: Slot 1, MDA 2 configuration modified 23 2006/08/17 15:30:55.29 UTC WARNING: SYSTEM #2007 - PORT Pool on Port 1/2/b.net-sap Modified managed object created . 5 2006/08/17 15:30:55.29 UTC MINOR: CHASSIS #2004 - Mda 1/2 Class MDA Module : wrong type inserted

The dialog that cried Wolf!

now you should complete the lab exercises to assist you in reinforcing this chapter s features. These lab exercises are carefully designed to give you hands-on experience configuring many of the technology standards that have been discussed and should greatly aid you in your exam preparation.

Confirmations illustrate an interesting quirk of human behavior: They only work when they are unexpected. That doesn t sound remarkable until you examine it in context. If confirmations are offered in routine places, users quickly become inured to them and routinely dismiss them without a glance. Dismissing confirmations thus becomes as routine as issuing them. If, at some point, a truly unexpected and dangerous situation arises one that should be brought to a user s attention he will, by rote, dismiss the confirmation, exactly because it has become routine. Like the fable of the boy who cried Wolf, when there is finally real danger, the confirmation box won t work because it cried too many times when there was no danger. For confirmation dialog boxes to work, they must only appear when a user will almost definitely click the No or Cancel button, and they should never appear when a user is likely to click the Yes or OK button. Seen from this perspective, they look rather pointless, don t they

The following lab is designed to reinforce your knowledge of the content in this chapter. Please review the instructions carefully and perform the steps in the order in which they are presented. The practice labs require that you have access to three or more Alcatel-Lucent 7750 SRs or Alcatel-Lucent 7450 ESSs in a non-production environment.

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Three design principles provide a way to eliminate confirmation dialog boxes. The best way is to obey the simple dictum: Do, don t ask. When you design your software, go ahead and give it the force of its convictions (backed up, of course, by user research, as discussed in 4). Users will respect its brevity and its confidence.

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