Thursday, October 21, 2010

Advanced Traceability - to meet the argument


7.3 to meet the arguments

Discussed in Section 7.2 to achieve the basic traceability, for many organizations is an important development step. Indeed, the change in organizational culture, using even this simple method, which itself may be a big step. However, there is always more we can do.
In the example shown in Figure 7.1, three system requirements to some extent to fully meet customer needs. However, by non-experts to test this assertion is difficult, because there is no reason given.

Better approach is for each user needs to provide a "meet the argument." As shown in Figure 7.1 for the basic traceability, the only information provided to meet the needs of the three systems act as a role in the argument, but not exactly what direction what is the argument.

Rich traceability is a way to capture the argument to meet. This method is the user needs and system requirements corresponding to another description, shown in Figure 7.3.



Not only to meet the argument described in text mode, but also the use of logic operators describe the way the combined system requirements:

鈼?and (&) operator to meet the argument that the user needs requires the establishment of all system requirements;
鈼?or (or) operator to meet the argument that the user needs requires the establishment of an arbitrary system requirements.

Figure 7.4 shows an example or to provide heating cycle, or gas ring, or two laps, all meet. Note that the argument of the two-logic structure.

Now offers more and more are to meet the needs of information users, if not the domain experts can assess important aspects of the argument. Text help to assess the accuracy and integrity of the logical argument. Operator to make the argument structure more accurately.

Please pay special attention, for Figure 7.2, a collection of system requirements that alternative solutions is very clear, and for Figure 7.4, the expression of this fact is very specific. If you can not provide electric circle, the circle continues to meet the demand through the gas.

On the first taste of the rich traceability through the "West Coast Railway Modernization" project, Praxis Critical System company needs a team proposes a management process and the use of the "design evaluation" of the data model. The same concept can also be found in a variety of similar methods, which meet the arguments have different terminologies, such as "needs more detail", "the basic principles of traceability," "strategy" and so on.



In addition to lower demand, the argument may also depend on to meet a lot of content. Figure 7.5 shows a use of "domain knowledge" to support the argument of the case. Domain knowledge about the real world, a fact or hypothesis does not itself bound solution. In this case, domain knowledge description is to satisfy the basic part of the argument, said box with ramp.




Capture this assumption is important because the real world as well as on assumptions made by the real world are changing. Once captured this assumption, you can use to export analysis to understand the changing assumptions on the system ability to meet their needs.

One such example is the New York subway. 70 years a series of accidents occurred due to incorrectly assume that the train's braking distance. Although initially been confirmed, but after a few years later become heavier trains, braking distance increases, the old assumptions no longer valid. Although the initial operation of the signal system is correct, but no evolution, changed assumptions imply a specific time from the start, signaling system no longer meet the demand.

Through effective traceability can provide records and the ability to track the role of this assumption.

Non-demand information to meet the arguments of another example of work from modeling. Meet the arguments often through complex modeling
Activities of export, the complete details are too detailed, can not capture rich traceability.

Figure 7.6 shows an example from a railway project, which satisfy the argument depends on the use of a tool called VISION timetable for modeling complex activities. Derived through this modeling tool subsystem a set of assumptions and requirements, according to the formation of rich traceability structure of the document. The reference model box with rounded corners, said.




In this example, the need to reconsider the analysis of the modeling activities will obviously impact.
Rich traceability of course, can also be used for multi-demand or object. Figure 7.7 shows three levels and between levels of traceability.








相关链接:



CG City Wizard - Wizard is the beginning (1)



SoftBrands, Because Focusing So Professional



Kunming, Yunnan Province ASRock Core Agent Signing



MKV to FLV



NEWS about Audio Recorders



VBScript Month function



Hot Science Education



Advice: be careful to format the disk partition



Getting Started with Corel Draw 10 (4) hands to create vector graphics (1)



Fix Ie Memory Errors Repair It Here



Lists Dictionaries Education



Premier Download Managers



e-cology in the Pan Micro Series 17



DV to AVI



Characteristics of GIS



How to promote sales will Not die



Friday, October 8, 2010

Only micro-blog is not "micro-complaints"



Micro-blog era, did it have to drive "micro-complaint" out of fashion? Micro-Bo Bo Wen's words to each limited to 140 characters to accommodate SMS restrictions on the number of words in order to achieve a variety of media, computers and mobile phones Interconnection spreading effect. To some extent, limit 140 words known to the world laid the foundation for popular micro-Bo. However, the limit to 100 characters of "micro-complaints" such Laus son, destined to be cursed by the people, because 100 characters is difficult to make it clear that the circumstances surrounding a complaint.

I am dedicated to the Dantu District government website pages visited some complaints, it is a simple enough "message board" program. User message limited to words, is the previous "narrow bandwidth" habitual practice of the times. Take this technology to meet the people behind the complaints, a government Web site is really ready to come out lazy and run down image. As expected, the local government will make the responsibility to provide services related to the company website.

Appears limited to 100 words "micro complaints" of the paradoxes, the local government is rooted in the lack of complaints in good faith. Government staff to test their ability to onset of this complaint system, is not difficult. Moreover, as long as the identified problems, modify the word limit can not be technically simple to simple. However, complaints of such a system just like ornaments on behalf of the Government of the cold on how long people do not know already, the Government had no knowledge of, can not help but blame it on lazy lazy.

In local government "OCS" are more a "government websites are not updated a long time," the news has been exposed. Today, network access to 2.0 or even 3.0 times, in times on the network still has much work space. Some areas of public complaints Instead, IMIS does not appear that the technical Mishap Dantu, but the responses are often seen in complaints "have read" "has been passed on in a sector" of the bureaucratic class, can not help but feeling the powerful bureaucracy and stubborn.







Recommended links:



E-cology in the Pan Micro Series 46



How to identify real and can automatically create index index



YouTube To FLV



Ningbo CHIC - Yum CRC show "weapon"



FLEXENG.DLL quot error avoid these errors



Specialist Games Arcade



TD Union angrily Qualcomm to mislead the public in the patent fees



On The memory leak (1)



MKV to MOV



TOSHIBA to pay for dedicated HD-DVD format, Paramount has been criticized



Negative comments: the right decision, "patron saint"



VOB to WMV



Some tips on data collection



Zhou Hongyi: Free Mode Subversive



Evaluation Covert Surveillance