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They can be useful disaster checks during development, but the costs of changes at this point in time, money, and morale can be high Formative evaluations are conducted in the service of design, during the design process..

private void log(String msg) t m-guiMessage = new CUIMessage (m-mystate.myID 0, CUIMessage . GUIM-NODEOUTPUT ,

Figure 7.5 TCP sends SEQ number 27000, which is acknowledged by the receiver, and the receiver indicates it expects to receive 27500 next. The sender then sends two segments with numbers 27500 and 28000, but 27500 is lost. The receiver does not acknowledge that it received 28000 because this would indicate to the sender that it received both 27500 and 28000. Instead, the receiver repeats the acknowledgement, indicating that it is still expecting 27500, which is how the sender recognizes that 27500 was lost and that it needs to re-send. Once 27500 is received, the receiver requests segment 29000 since it has already received 28000 and 28500.

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There are a wide variety of perspectives on how to conduct and interpret usability tests. Unfortunately, we ve found that many of these approaches either presume to replace active design decision making, or are overly quantitative, resulting in nonactionable data about things like time to task. A good reference for usability testing methods that we ve found to be compatible with Goal-Directed interaction

SEQ number 27000 TCP 500 bytes data ACK number 27500 SEQ number 27500 TCP 500 bytes data SEQ number 28000 TCP 500 bytes data ACK number 27500 SEQ number 28500 TCP 500 bytes data ACK number 27500 Retransmit SEQ number 27500 TCP 500 bytes data ACK number 29000

design methods is Carolyn Snyder s Paper Prototyping. It doesn t discuss every testing method or the relationship between testing and design, but it covers the fundamentals well and provides some relatively easy-to-use techniques for usability testing. In brief, we ve found the following to be essential components to successful formative usability tests:

7.2 T R A nSP O RT C On T RO L PRO TO C O L (TC P)

Test late enough in the process that there is a substantially concrete design to test, and early enough to allow adjustments in the design and implementation Test tasks and aspects of the user experience appropriate to the product at hand Recruit participants from the target population, using your personas as a guide Ask participants to perform explicitly defined tasks while thinking aloud Have participants interact directly with a low-tech prototype (except when testing specialized hardware where a paper prototype can t reflect nuanced interactions) Moderate the sessions to identify issues and explore their causes Minimize bias by using a moderator who has not previously been involved in the project Focus on participant behaviors and their rationale Debrief with observers after tests are conducted to identify the reasons behind observed issues Involve designers throughout the study process

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Figure 7.5 shows reliable data transfer between two hosts: 1. The sender sends a TCP segment with 500 bytes of data on an established connection. The sequence number is 27000. 2. The receiver acknowledges the receipt of this data with an acknowledgement number of 27500. 3. The sender sends another segment of 500 bytes with a sequence number of 27500. This segment is lost by the network (unreliable service). 4. The sender sends another segment of 500 bytes with a sequence number of 28000. This segment is successfully received by the receiver and is buffered. 5. The receiver sends an acknowledgement number of 27500 because the receiver still has not received the segment that contains the 500 bytes of data in the overall data stream. 6. The sender sends another segment of 500 bytes with a sequence number of 28500. This segment is received and buffered. Another acknowledgement of 27500 is sent. 7. The re-transmission timer expires for the sender, and the missing segment that contains 27500 is re-transmitted. 8. The receiver receives the segment 27500 and now has the data up to byte 29000. The receiver sends an acknowledgement of 29000.

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