A Rationale-based Model for Architecture Design Reasoning

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11.4. Analysing AREL with BBN separate diagram called Traceability Graph. A sample of a result is shown in Figure 11.11. Through Enterprise Architect, architects can access the results of the tracing, explore the design rationale contained in the ARs and so on. Figure 11.11: An Example of AREL Trace Result 11.4 Analysing AREL with BBN As noted earlier, Enterprise Architect does not contain any functionality to capture or compute the probabilities required in a BBN. The reason for it is because we cannot build this facility into Enterprise Architect without implementing all the BBN functionalities. It would be a highly complex exercise. Therefore, we rely on another program to perform the BBN functionalities. Netica (version 2.17) [107] provides the BBN functionalities that allow us to implement the AREL-BBN modelling and it has the flexibility to interface with other packages as well. The nodes and links in an AREL model is constructed with Enterprise Architect, and it has to be an acyclic graph to be used for BBN computation. The probability capture is performed by Netica. As such, the information which are captured by the two packages need to be merged together. The steps to create and merge this information are described below (also see Figure 11.12): 199
11.4. Analysing AREL with BBN • Step 1 - construct the design objects and capture the design decisions using Enterprise Architect. • Step 2 - use the AREL Tool to convert the AREL model in the UML notation into the Netica repository format (i.e. Netica .dne extension). This is achieved by clicking the Export BBN button to export the AREL model to Netica. • Step 3 - Netica reads the exported file and designers can assign prior and conditional probabilities to AEs and ARs for BBN computation. Figure 11.12: A Process to Extract AREL Model from UML into BBN As designers continue to make decisions and modify the decision structure over the lifespan of a system, the AREL model (in UML) would change accordingly. These changes need to be reflected in Netica without having to re-enter all the probabilities previously assigned. This would happen when the following design changes take place: • AE and AR nodes are added - prior or conditional probabilities need to be captured for the new nodes. • AE and AR nodes are deleted - those nodes which depend on the deleted nodes should have their CPTs adjusted. 200
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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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5.3. Survey findings experience). I
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5.3. Survey findings Table 5.1: Fre
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5.3. Survey findings Business Goals
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5.3. Survey findings 5.3.5 Document
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5.3. Survey findings Table 5.8 summ
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5.3. Survey findings We used Spearm
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5.3. Survey findings previous desig
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5.4. Discussion of findings Since t
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5.4. Discussion of findings or cons
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5.5. Limitations and use design rat
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Part III The Representation and App
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6.1. A conceptual model for design
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6.2. Architecture Rationale and Ele
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6.2. Architecture Rationale and Ele
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6.3. Architecture elements Figure 6
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6.4. Architecture rationale Figure
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6.4. Architecture rationale • ris
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6.4. Architecture rationale depicts
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6.5. The extended AREL To prevent c
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6.6. A UML representation of AREL a
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6.6. A UML representation of AREL a
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6.7. AREL usability AE by ≪AEsupe
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6.8. Summary The AREL model is exte
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7.1. The EFT system reasoning, a co
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7.1. The EFT system The processing
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7.1. The EFT system not chosen beca
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7.1. The EFT system Figure 7.5: Int
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7.1. The EFT system sequence checki
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7.1. The EFT system Figure 7.7: Dec
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7.1. The EFT system Therefore, in a
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7.1. The EFT system Figure 7.10: De
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7.2. An empirical study to validate
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7.3. Summary The case study is spec
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8.1. Background Based on these assu
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8.2. The architecture rationalisati
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8.3. Other applications of ARM As d
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8.3. Other applications of ARM Figu
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Page 215 and 216: 11.2. Checking AREL models Figure 1
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Page 233 and 234: BIBLIOGRAPHY [10] B. W. Boehm, Soft
Page 235 and 236: BIBLIOGRAPHY [37] A. Eden and R. Ka
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Page 239 and 240: BIBLIOGRAPHY [89] N. Lassing, D. Ri
Page 241 and 242: BIBLIOGRAPHY [115] D. L. Parnas,
Page 243 and 244: BIBLIOGRAPHY [142] Z. Simsek and J.
Page 245 and 246: BIBLIOGRAPHY [167] W. F. Tichy, N.
Page 247 and 248: Appendix A AREL Tool User Manual 1
Page 249 and 250: 4.1 AREL Check Model When the Check
Page 251 and 252: 4.2 AREL Model Tracing AREL model t
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Page 265 and 266: Complaint Procedure If you have any
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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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