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Popularized by information architects, card sorting is a technique to understand how users organize information and concepts. While there are a number of variations on the technique, it is typically performed by asking users to sort a deck of cards, each containing a piece of functionality or information related to the product or Web site. The tricky part is analyzing the results, either by looking for trends or using statistical analysis to uncover patterns and correlations. While this can undoubtedly be a valuable tool to uncover one aspect of a user s mental model, the technique assumes that the subject has refined organizational skills, and that the way that they sort a group of abstract topics will correlate to the way they will end up wanting to use your product. This is clearly not always the case. One way to overcome these potential challenges is to ask the users to sequence the cards based upon the completion of tasks that the product is being designed to support. Another way to enhance the value of a card sort study is to debrief the subject afterwards to understand any organizational principles they have employed in their sort (again, attempting to understand their mental model). Ultimately, we believe that properly conducted open-ended interviews are quite capable of exploring these aspects of the user s mental model. By asking the right questions and paying close attention to how a subject explains his activities and the domain, you can decipher how he mentally associates different bits of functionality and information.

TCP is by far the most important transport layer protocol and is second in importance of topics only to IP. TCP provides a wealth of features that allow for reliable communication across virtually any infrastructure, and it is extremely important that you have at least a basic understanding of the services that it provides and the mechanisms it uses to provide them. We begin with a discussion of the TCP header and its options. We then examine how TCP establishes a connection and how it provides a reliable data transfer over this connection. We conclude with an examination of TCP s flow/ congestion control mechanisms. The primary purpose of TCP is to provide reliable communications between application services. Because the lower layers are unreliable, TCP must guarantee the delivery of the data. note that saying that a lower layer is unreliable doesn t mean that the lower layers often fail. In fact, networks today are often very reliable. It simply means that the lower layers do not guarantee that a packet will be delivered. In all likelihood it will be delivered, but the lower layers do not have the onus of ensuring this occurs; TCP does. The original TCP specification is provided in RFC 793. This RFC specifies the key functionality provided by TCP. Some of these functions are: Data Transfer From the application-services viewpoint, TCP provides a contiguous stream of data through the network. TCP groups the bytes into segments and passes the segments to the IP for transmission to the destination. note that this

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Task analysis refers to a number of techniques that involve using either questionnaires or open-ended interviews to develop a detailed understanding of how people currently perform specific tasks. Of concern to such a study is:

means that an application does not need to know or care how the data is transferred by TCP It simply hands off a stream of data through an Application Programming Interface (API) call to the TCP service, and TCP handles the rest This allows for an application developer to write very simple programming calls to TCP without having to specify how the data is to be transferred across the network Reliability TCP uses sequence numbers, which count each byte transmitted, and TCP waits for an acknowledgment from the receiving host If the acknowledgment is not received within a specific interval, the data is re-transmitted note that this is a passive re-transmission system The receiving host does not request missing data; it simply acknowledges only the data it has actually received.

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