A Rationale-based Model for Architecture Design Reasoning

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6.8. Summary issues with AREL. In Table 6.1, we recapitulate these usability features and describe how AREL has been implemented to fulfil them. Table 6.1: An Analysis of the Usability Features in AREL AREL Implementation Notes Effective capture of Yes Design rationale can be captured in ARs during the design process, design rational and AEs are captured as part of the architecture design. Effective communication of Yes AREL uses a UML graphical representation to communicate design rational the causal relationships between design rationale and design objects. Design Artefact Focus Yes AE can represent requirements, assumptions, constraints, and design objects. They are classified by different architecture viewpoints. Traceability and Yes AREL provides tool support to carry out tracing and Impact Analysis impact analysis. Comprehensive Design Rationale Yes AR contains qualitative and quantitative design rationale as well as alternative design options. Common Tool Support Yes A commercially available UML tool can be used to support AREL. The way AREL is structured is simpler than the argumentation-based methods because design deliberations are not captured. Instead, design rationale are encapsulated in an AR node and the various kinds of design reasoning are captured with templates. Therefore, it is simpler for architects to record and use them. The usefulness of the design rationale captured by AREL is further explored in an empirical study in Chapter 7. Other usability features are discussed as follows: traceability in Chapter 9, impact analysis in Chapter 10 and tool implementation in Chapter 11. 6.8 Summary In this chapter, we have introduced the AREL model to represent the architecture design rationale, architecture design elements and their causal relationships. We use a conceptual model to describe the high-level requirements of AREL. We distinguish between motivational reasons and design rationale. The AREL model is characterised as follows: • Architecture element - an architecture element is an input and/or an output of an architecture decision. It can be a motivational reason to a decision, and it can also be an outcome of the architecture decision. Architecture elements are classified by viewpoints. • Architecture rationale - an architecture rationale represents the reasons behind an architecture decision. It contains the qualitative rationale, the quantitative rationale and alternative designs. • Directional link between architecture elements and rationale - architecture elements that are used as inputs into the decision and the architecture elements which are created as the outcome are linked to the architecture rationale 103
6.8. Summary The AREL model is extended by eAREL to support the capture of design history. Both AREL and eAREL are implemented using UML. The AREL representation is an improvement over the argumentation-based design rationale methods because it simplifies the design rationale representation, design rationale therefore are easier to capture and communicate, and UML support is more readily available. Using the AREL model, applications such as design reasoning, traceability and impact analysis can be carried out. 104
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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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Page 107 and 108: 6.3. Architecture elements Figure 6
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9.2. Traceability of architecture r
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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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