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5: Modeling Users: Personas and Goals Determine what a product should do and how it should behave. Persona goals and tasks provide the foundation for the design effort. Communicate with stakeholders, developers, and other designers. Personas provide a common language for discussing design decisions and also help keep the design centered on users at every step in the process. Build consensus and commitment to the design. With a common language comes a common understanding. Personas reduce the need for elaborate diagrammatic models; it s easier to understand the many nuances of user behavior through the narrative structures that personas employ. Put simply, because personas resemble real people, they re easier to relate to than feature lists and flowcharts. Measure the design s effectiveness. Design choices can be tested on a persona in the same way that they can be shown to a real user during the formative process. Although this doesn t replace the need to test with real users, it provides a powerful reality-check tool for designers trying to solve design problems. This allows design iteration to occur rapidly and inexpensively at the whiteboard, and it results in a far stronger design baseline when the time comes to test with actual people. Contribute to other product-related efforts such as marketing and sales plans. The authors have seen their clients repurpose personas across their organization, informing marketing campaigns, organizational structure, and other strategic planning activities. Business units outside of product development desire sophisticated knowledge of a product s users and typically view personas with great interest.

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Both alternate and back-up ports remain in a discarding state unless there is a topology change that causes them to become the designated port. By keeping track of these additional ports, STP can allow a designated bridge to quickly transition its original root port to an alternative port in the event of a link or switch failure in the path to the root bridge. These enhancements are part of the rSTP changes made to STP in the 2004 release. In the next section, we leave the topics of STP and redundancy and wrap up this chapter with a discussion of virtual LANs.

Personas also can resolve three design issues that arise during product development:

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A virtual LAN (VLAN) is a mechanism that allows you to segregate devices, and their associated traffic from other devices and traffic, even when all of the devices are physically part of the same switched infrastructure. The astute reader may immediately

Although satisfying the users of our products is our goal, the term user causes trouble when applied to specific design problems and contexts. Its imprecision makes it dangerous as a design tool every person on a product team has his own conceptions of who the user is and what the user needs. When it comes time to make product decisions, this user becomes elastic, conveniently bending and stretching to fit the opinions and presuppositions of whoever s talking. If the product development team finds it convenient to use a confusing tree control containing nested, hierarchical folders to provide access to information, they might

wonder why you couldn t simply use a router to achieve this sort of separation. There is some merit to this question, as routers are the mechanisms that are typically used to segregate groups of Ethernet devices from one another. However, there are physical limitations on the deployment of routers, and those limitations may not match the physical locations for the deployment of devices in the same VLAN. For example, you might have devices in multiple buildings that are part of the same segregated group, and there might be a multiple of these types of groups in each building. Your goal would be to allow the devices in the segregated group to communicate with each other, but not with any other Ethernet devices. This would be difficult to accomplish using traditional network segregation with routers, but it is trivially easy with VLAN technology. There are two main reasons to use VLANs: To decrease the amount of broadcast traffic To increase the security of your network Let s first examine the reasons for decreasing the amount of broadcast traffic in your network. Broadcast traffic is increased in direct proportion to the number of stations in the LAN, as illustrated in Figure 4.14. Note that flat network means a network without routers or without VLANs or both.

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