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Another excellent way to eliminate error messages is to make the application smart enough that it no longer needs to make unnecessary demands. Many error messages say things like Invalid input. User must type xxxx. Why can t the program, if it knows what the user must type, just enter xxxx by itself and save the user the tongue-lashing Instead of demanding that a user find a file on a disk, introducing the chance that the user will select the wrong file, the program should remember which files it has accessed in the past and allow a selection from that list. Another example is designing a system that gets the date from the internal clock instead of asking for input from users. Undoubtedly, all these solutions will cause more work for programmers. However, it is the programmer s job to satisfy users and not vice versa. If the programmer thinks of the user as just another input device, it is easy to forget the proper pecking order in the world of software design. Users of computers aren t sympathetic to the difficulties faced by programmers. They don t see the technical rationale behind an error message box. All they see is the unwillingness of the program to deal with things in a human way. They see all error messages as some variant of the one shown in Figure 25-2.

As previously mentioned, context-sensitive help for any command can be obtained through use of the .

Figure 25-2 This is how most users perceive error message dialog boxes. They see them as Kafkaesque interrogations with each successive choice leading to a yet blacker pit of retribution and regret.

The Alcatel-Lucent SR/ESS series products can be accessed in three ways: in-band ports such as on MDAs, a console port, and a CPM Ethernet management port. The console port is a DB-9 serial port on the SF/CPM card for a modular chassis or on the chassis itself for the SR-1 or ESS-1. The location of these ports is shown in Figure 2.14.

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One of the problems with error messages is that they are usually ex post facto reports of failure. They say, Bad things just happened, and all you can do is acknowledge the catastrophe. Such reports are not helpful. And these dialog boxes always come with an OK button, requiring the user to be an accessory to the crime. These error message boxes are reminiscent of the scene in old war movies where an ill-fated soldier steps on a landmine while advancing across the rice paddy. He and his buddies clearly hear the click of the mine s triggering mechanism and the realization comes over the soldier that although he s safe now, as soon as he removes his foot from the mine, it will explode, taking some large and useful part of his body with it. Users get this feeling when they see most error message boxes, and they wish they were thousands of miles away, back in the real world.

Figure 2.14 This figure shows the CPM serial console port and the CPM out-of-band Ethernet management port.

The MetaGME paradigm that is used to specify the domain-specific metamodels provides basic building blocks that are used to define the structure of valid models in the target domain. Examples of the building blocks include atom, model connection, reference, etc. The GME users manual explains the metamodeling and modeling concepts and processes in more detail. Here, we present the metamodels that are defined to create the ATaG programming environment.

One of the reasons why software is so hard to learn is that it so rarely gives positive feedback. People learn better from positive feedback than they do from negative feedback. People want to use their software correctly and effectively, and they are motivated to learn how to make the software work for them. They don t need to be slapped on the wrist when they fail. They do need to be rewarded, or at least acknowledged, when they succeed. They will feel better about themselves if they get approval, and that good feeling will be reflected back to the product. Advocates of negative feedback can cite numerous examples of its effectiveness in guiding people s behavior. This evidence is true, but almost universally, the context of effective punitive feedback is getting people to refrain from doing things they want to do but shouldn t: things like not driving over 55 mph, not cheating on their spouses, and not fudging their income taxes. But when it comes to helping people do what they want to do, positive feedback is best. If you ve ever learned to ski, you know that a ski instructor who yells at you isn t helping the situation.

SR-1

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