A Rationale-based Model for Architecture Design Reasoning

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Chapter 11 Tool implementation In the previous chapters, we have described the AREL representation and its applications to support architecture design and maintenance. This chapter describes the tools used supporting these activities. The AREL tool-set captures AE, AR, AAR and their relationships described in Chapter 6. It can be used to support the ARM process since it captures the QLR and QNR (see Chapter 8). It supports the traceability methods (see Chapter 9) and change impact analysis using BBN (see Chapter 10). In an empirical study described in Section 7.2.4, expert designers have indicated that the success of AREL would depend on its tool implementation. First of all, they think that a graphical tool is important to represent such relationships. They suggest that without a graphical tool, it would be ineffective to use AREL because of the complex relationships that might exist in a large system architecture. They further suggested that the tool must be able to retrieve the information by allowing architects to specify the selection criteria for information retrieval. In addressing these needs, we have established four objectives when building the toolset to support AREL implementation: (a) the design tool should use commercially supported software so that it can integrate with architecture design processes in the software industry; (b) the graphical notation must be an industry standard and as such we have chosen to use UML; (c) a tight integration of the tool-set for easy learning and application; (d) the tools must support the key features of the AREL applications. The tool-set to support the AREL applications comprises of three components, Enterprise Architect [150], Netica [107], and our custom-built AREL Tool. Together they form the AREL tool-set. Their relationship is shown in Figure 11.1. The three components of the AREL tool-set exchange information via the Enterprise Architect repositories and 191
11.1. Capturing architecture design rationale Netica repositories. Figure 11.1: The AREL Tool-set The key features of the tool components are as follows: • Enterprise Architect - a UML tool that supports the design of a system. We have enhanced it to support architecture rationale capture and to relate architecture rationale with architecture design. • AREL Tool - this is our custom-developed program to support consistency checking of the AREL models and to support AREL model tracing. It also converts UML models into Netica models. • Netica - a BBN tool to support the capture of prior probabilities and CPTs. computes the posterior probabilities when evidence is inserted into the BBN. It A detailed description of the tool implementation to support AREL and its applications are provided in the following sections. 11.1 Capturing architecture design rationale Previous research in the area of design rationale has indicated that there are two usability criteria for design rationale systems. Capturing design rationale must have minimal interference with the design process [132] and the users of design rationale must be able to retrieve the reasons to answer their “why such-a design” questions [62]. Therefore, the tool set should be able to support both the architecture design process and the design reasoning process. We address these issues in AREL by integrating commercially available tools to our custom-developed programs to provide the functionality. The tool to capture AREL models is a UML tool, Enterprise Architect (version 5.00.767). Since AREL is meant to be a part of the architecture development process 192
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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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8.2. The architecture rationalisati
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Page 189 and 190: 10.2. Building a BBN to represent a
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Page 215 and 216: 11.2. Checking AREL models Figure 1
Page 217 and 218: 11.3. Tracing AREL models Figure 11
Page 219 and 220: 11.4. Analysing AREL with BBN • S
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Page 233 and 234: BIBLIOGRAPHY [10] B. W. Boehm, Soft
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Page 237 and 238: BIBLIOGRAPHY [62] J. D. Herbsleb an
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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) 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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