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Task coherence predicts what users will do in the future with reasonable, but not absolute, certainty. If our application relies on this principle, it s natural to wonder about the uncertainty of our predictions. If we can reliably predict what the user will do 80% of the time, it means that 20% of the time we will be wrong. It might seem that the proper step to take here is to offer users a choice, but this means that they will be bothered by an unnecessary dialog 80% of the time. Rather than offering a choice, the application should go ahead and do what it thinks is most appropriate and allow users to override or undo it. If the undo facility is sufficiently easy to use and understand, users won t be bothered by it. After all, they will have to use undo only two times out of ten instead of having to deal with a redundant dialog box eight times out of ten. This is a much better deal for humans.

formed. On point-to-point links, OSPF traffic is always sent to the reserved multicast address 224.0.0.5. Although Hello messages are important, they are only the beginning of the process of forming an adjacency. Let s examine the entire process of forming an adjacency from beginning to end. In Figure 9.4, routers r1 and r2 have been rebooted and therefore need to form a new adjacency.

The essence of mixed imperative-declarative specification is the separation of task functionality from the conditions that govern the instantiation of that functionality on one or more nodes of the network at a given time. The need to specify where (spatial) and when (temporal) such instantiation should occur leads to two classes of task annotations: The first is related to placement (spatial) and the second specifies the firing rules (temporal). Annotations in these two classes govern spatial and temporal task instantiation, respectively.

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Some interface designers speak of finding the right metaphor upon which to base their interface designs. They imagine that filling their interface with images of familiar objects from the real world will give their users a pipeline to easy learning. So, they create an interface masquerading as an office filled with desks, file cabinets, telephones, and address books, or as a pad of paper or a street of buildings. If you, too, search for that magic metaphor, you will be in august company. Some of the best and brightest designers in the interface world consider metaphor selection as one of their first and most important tasks. We find this very literal approach to be limiting and potentially problematic. Strict adherence to metaphors ties interfaces unnecessarily to the workings of the physical world. One of the most fantastic things about digital products is that the working model presented to users need not be bound by the limitations of physics and the inherent messiness of real three-dimensional space. User interfaces based on metaphors have a host of other problems as well: There aren t enough good metaphors to go around, they don t scale well, and the ability of users to recognize them is often questionable, especially across cultural boundaries. Metaphors, especially physical and spatial metaphors, have an extremely limited place in the design of most Information-Age, software-enabled products. In this

Figure 9.4 Routers R1 and R2 have been rebooted and need to form an adjacency. They are initially in the OSPF down state. The routers begin sending OSPF Hello packets and proceed to the OSPF init state. Once the routers see their own router ID in a neighbor s Hello updates, they move to the two-way state and are ready to begin an exchange of link state database information.

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