A Rationale-based Model for Architecture Design Reasoning

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7.1. The EFT system 7.1.3 Payment messaging When designing the architecture, one of the fundamental decisions was the scope of responsibility of a payment process. A single process (i.e. an UNIX process) could be responsible for all of the application processing, message processing and communication. It could also be divided into multiple processes which work together collaboratively. Figure 7.4 depicts the decisions in the EFT system. It was decided that the Message Control Process (MCP) should be an independent process (AR6 ) because it has to support multiple message formats simultaneously (Requirements R2 1 3 and R2 8 1 ). Most important of all, this is what the national payment standard had dictated (R2 1 1 and R5 1 0 ). It was envisaged that the EFT system would evolve into the national payment system (assumption R3 2 6 ). This assumption formed a constraint that basically influenced the design philosophy of the system. As such, the architecture design of EFT was to cater for a software product that could be configured to suit different payment applications instead of a single customer solution. Figure 7.4: Message Control Processing As a result of decision AR9, two additional layers of processing were required. They were the application layer (C9 0 0 ) and the communication layer (C4 3 0 ). These layers of software would exchange information with MCP (C4 2 0 )through interfaces. 111
7.1. The EFT system Figure 7.5: Intertwined Issues in the Architecture of MCP The design of the MCP process involved many requirements. Figure 7.5 is a diagram which illustrates some of the key decisions. In the design process, one of the key issues was the way payment messages are to be composed and decomposed. At the time of the design, an initial draft of the national payment message standard was specified in the Request for Proposal (R2 1 3 ). This format was used as a basis for the EFT system since the EFT system was aimed at becoming a product which could be reused at the national level. As such, it was anticipated that the message format would be adaptable. As a result, the design of the message format was entirely definition-driven instead of hard-coding. This decision justifications are contained in AR11. The message exchange protocol was another key decision which had to be made. Requirement R2 3 5 specifies that a bank can have multiple connections to the payment processing centre. This is so that large volume of transactions can be sent through multiple bank branches settling through the same settlement account. There were two options 112
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A Rationale-based Model for Archite
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maintenance. These techniques can h
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Declaration This thesis contains no
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2.2.6 DoD Architecture Framework .
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5.4.6 Risk assessment in architectu
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8.2 The architecture rationalisatio
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12.2 Contributions . . . . . . . .
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6.10 ≪AR≫ and ≪AAR≫ Stereot
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11.13A Process to Synchronise Chang
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5.13 Design Rationale Helps Evaluat
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that architecture design is highly
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1.2. Research motivations and resea
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1.2. Research motivations and resea
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1.4. Structure of the thesis the ch
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Part I Problem Analysis 10
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2.1. Industry practice of design ra
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2.2. Architecture frameworks and de
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Chapter 3 Related work in design ra
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3.2. Why do we need design rational
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3.2. Why do we need design rational
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3.3. Existing methods for capturing
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3.4. Other related studies 3.3.7 Qu
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3.4. Other related studies evolutio
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3.5. How well design rationale meth
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3.5. How well design rationale meth
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Chapter 4 Research methodology and
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4.1. Software engineering research
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4.2. The chosen research and valida
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Part II Architecture Design Rationa
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on a regular basis. Their inputs ha
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5.1. Architecture rationale in the
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5.2. Survey methodology data collec
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Page 83 and 84: 5.3. Survey findings Business Goals
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Page 89 and 90: 5.3. Survey findings We used Spearm
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Page 99 and 100: Part III The Representation and App
Page 101 and 102: 6.1. A conceptual model for design
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Page 107 and 108: 6.3. Architecture elements Figure 6
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Page 113 and 114: 6.4. Architecture rationale depicts
Page 115 and 116: 6.5. The extended AREL To prevent c
Page 117 and 118: 6.6. A UML representation of AREL a
Page 119 and 120: 6.6. A UML representation of AREL a
Page 121 and 122: 6.7. AREL usability AE by ≪AEsupe
Page 123 and 124: 6.8. Summary The AREL model is exte
Page 125 and 126: 7.1. The EFT system reasoning, a co
Page 127 and 128: 7.1. The EFT system The processing
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Page 137 and 138: 7.1. The EFT system Therefore, in a
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Page 141 and 142: 7.2. An empirical study to validate
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Page 171 and 172: 9.1. Background 9.1 Background In t
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9.4. AREL and eAREL traceability ap
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9.4. AREL and eAREL traceability ap
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Chapter 10 Architecture decision de
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10.1. Background 10.1.2 Introductio
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10.2. Building a BBN to represent a
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10.3. Reasoning about change impact
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10.5. Summary design object may cau
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11.1. Capturing architecture design
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11.1. Capturing architecture design
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11.2. Checking AREL models Figure 1
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11.3. Tracing AREL models Figure 11
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11.4. Analysing AREL with BBN • S
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11.5. Limitations Figure 11.13: A P
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Chapter 12 Conclusions 12.1 Summary
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12.2. Contributions reasoning metho
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12.2. Contributions implementations
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12.3. Future work architecture deci
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12.3. Future work to examine the co
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BIBLIOGRAPHY [10] B. W. Boehm, Soft
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BIBLIOGRAPHY [37] A. Eden and R. Ka
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BIBLIOGRAPHY [62] J. D. Herbsleb an
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BIBLIOGRAPHY [89] N. Lassing, D. Ri
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BIBLIOGRAPHY [115] D. L. Parnas,
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BIBLIOGRAPHY [142] Z. Simsek and J.
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BIBLIOGRAPHY [167] W. F. Tichy, N.
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Appendix A AREL Tool User Manual 1
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4.1 AREL Check Model When the Check
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4.2 AREL Model Tracing AREL model t
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Figure 9 - result of downward trace
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To initiate the graph’s creation,
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onto the diagram 14 Assign values t
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Useful Definitions The following ar
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) Some projects only c) Not at all
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19. I revisit architecture design d
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Complaint Procedure If you have any
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Privacy Protection Only investigato
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B. Exploring design reasoning. 1. W
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3. Why does the system use asynchro
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C. General Comments on AREL Modelli
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IEEE Computer Society Press. A. Tan
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A Rationale-based Model for Architecture Design Reasoning

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