A Rationale-based Model for Architecture Design Reasoning

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6.4. Architecture rationale (a) (b) Figure 6.7: (a) Cyclic Design (b) Acyclic Design • Identify the root goal of the design - the important goals behind a decision are identified. In this case, relevant requirements such as FR-Sales Report and NFR- Response Time should be considered (as shown in Figure 6.7(b)) because they affect the implementation of D-Custom Report Design. Figure 6.7(a) does not have these relationships. Should there be a change in the performance requirements, it would not be able to trace this change to D-Custom Report Design. • Avoid ambiguity - if we were to modify D-Embedded SQL to support remote database access (in Figure 6.7(a)), it would be ambiguous and difficult to determine whether D-Embedded SQL or D-Generic Reporting Function is the cause of the decision relationship. 95
6.5. The extended AREL To prevent cycles from occurring in AREL, we provide an AREL Tool to carry out consistency checking to detect directed cycles (see Chapter 11). The AREL Tool warn architects about the directed cycles in a model. Human reasoning would be required to modify the structure of the architecture design reasoning to resolve such reasoning anomalies. 6.5 The extended AREL Software architecture design evolves over time due to changes in the business requirements or in the business environment. As the architecture design evolves, the original design and their design rationale can be lost. An architect who is not exposed to the passage of events often cannot understand the convoluted architecture design due to past changes [157]. This may often prevent sound design decisions to be made during system maintenance and enhancements. To address this issue, we define an extended version of AREL called eAREL below to capture the evolution history. Definition 2 An extended AREL model eAREL is a tuple (AE, AR, P L, SP ), where AE, AR and P L are sets of architecture elements, architecture rationales and directed links, respectively, and SP is a bijective supersedence function between architecture elements or between architecture rationales, such that 1. let AE c ⊆ AE, AR c ⊆ AR and P L c ⊆ P L ∩ ((AE c × AR c ) ∪ (AR c × AE c )) be the sets of architecture elements, rationales and directed links present in the current architecture design, respectively, then (AE c , AR c , P L c ) is the AREL model for the current architecture design; 2. let AE h = AE \ AE c and AR h = AR \ AR c be the sets of architecture elements and rationales stored for previous architecture designs, respectively, then the supersedence function satisfies SP : (AE → AE h ) ∪ (AR → AR h ), and it is a bijective function. In an eAREL model, both AR and AE have one current version and one or more historical versions. The current versions of AR and AE are denoted by AR c and AE c , respectively, and the historical versions of AR and AE are denoted by AR h and AE h , respectively. When an AR or an AE is superseded by a current version, the superseded elements are kept in superseded elements AR h and AE h . If multiple supersedence exists, they are linked in a linear list. This supersedence chain represents the direct supersedence relationship between different versions of architecture elements and rationales. The super- 96
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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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Page 65 and 66: Chapter 4 Research methodology and
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Page 71 and 72: Part II Architecture Design Rationa
Page 73 and 74: on a regular basis. Their inputs ha
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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 93 and 94: 5.4. Discussion of findings Since t
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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 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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8.3. Other applications of ARM Figu
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8.3. Other applications of ARM area
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Chapter 9 Architecture rationale an
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9.1. Background 9.1 Background In t
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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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