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After you have created a persona hypothesis, complete with potential roles and behavioral, demographic, and environmental variables, you then need to create an interview plan that can be communicated to the person in charge of coordinating and scheduling the interviews. In our practice, we ve observed that each presumed behavioral pattern requires about a half-dozen interviews to verify or refute (sometimes more if a domain is particularly complex). What this means in practice is that each identified role, behavioral variable, demographic variable, and environmental variable identified in the persona hypothesis should be explored in four to six interviews (sometimes more if a domain is particularly complex). However, these interviews can overlap. If we believe that use of an enterprise product may differ, for example, by geographic location, industry, and company size, then research at a single small electronics manufacturer in Taiwan would allow us to cover several variables at once. By being clever about mapping variables to interviewee-screening profiles, you can keep the number of interviews to a manageable number.

As mentioned in the previous section, Ethernet switches perform an intelligent forwarding operation. The Ethernet switch will forward a frame only to the port that needs to receive it. It performs this function by building a dynamic MAC address table that matches MAC addresses to ports so that it knows which ports correspond to which MAC addresses. Ethernet switches perform this process by using the source MAC address of packets arriving on ports to dynamically learn which MAC addresses are associated with an interface. The switch records this address information into a MAC forwarding database (FDB). This process is shown in Figure 4.3.

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After the persona hypothesis has been formulated and an interview plan has been derived from it, you are ready to interview assuming you get access to interviewees! While formulating the interview plan, designers should work closely with project stakeholders who have access to users. Stakeholder involvement is generally the best way to make interviews happen, especially for business and technical products. If stakeholders can t help you get in touch with users, you can contact a market or usability research firm that specializes in finding people for surveys and focus groups. These firms are useful for reaching consumers with diverse demographics. The difficulty with this approach is that it can sometimes be challenging to get interviewees who will permit you to interview them in their homes or places of work. As a last alternative for consumer products, designers can recruit friends and relatives. This makes it easier to observe the interviewees in a natural environment but also is quite limiting as far as diversity of demographic and behavioral variables are concerned.

Figure 4.3 Switches build up their FDB table by recording the source address of frames as they enter each port on the switch.

In addition to reducing the number of navigable places, another way to enhance users ability to find their way around is by providing better points of reference signposts.

When the switch receives an Ethernet frame, it records the source MAC address and the interface on which it arrived. It looks at the destination MAC address of the frame, compares it to the entries in its MAC FDB, and then transmits the frame out of the appropriate interface. If no entry is found, the switch floods the frame out of all its interfaces except the interface on which the frame arrived. If the destination device exists, when it replies, the switch will learn the MAC address on the receiving port, and future flooding for that destination will be unnecessary. Through this flooding and learning process, an Ethernet switch will quickly build up its MAC FDB and will maintain it until the switch is rebooted, at which point the entire learning process begins again. The learning and flooding process is illustrated in Figure 4.4.

Figure 1.5 Regiment code example: Determining the contour between adjacent areas of a sensor network [42].

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