A Rationale-based Model for Architecture Design Reasoning

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5.3. Survey findings Table 5.4: Importance of Each Generic Rationale Not Very Important Important 1 (%) 2 (%) 3 (%) 4 (%) 5 (%) Design Constraints 0.0 1.2 11.1 38.3 49.4 Design Assumptions 3.7 7.4 14.8 44.4 29.6 Weakness 2.5 7.4 28.4 43.2 18.5 Costs 0.0 7.4 14.8 43.2 34.6 Benefits 1.2 1.2 7.4 54.3 35.8 Complexity 0.0 2.5 25.9 46.9 24.7 Certainty of Design 0.0 3.7 11.1 29.6 55.6 Certainty of Implementation 2.5 4.9 16.1 32.1 44.4 Tradeoffs 0.0 4.9 30.9 44.4 19.8 4 or 5. This shows that most designers perceived that these rationales are important in reasoning about design decisions. Apart from the above-mentioned nine generic rationales, we also asked the respondents to add other rationales that they use for making architectural design choices. A significant number of the respondents (twenty eight), mentioned additional types of factors that influence their design choices. We have classified those factors into three broad categories. They are: 63
5.3. Survey findings Business Goals Oriented 1. Enterprise strategies, technical directions and organizational standards 2. Management preferences and acceptance 3. Adherence to industry standards 4. Vendors relationship Requirements Oriented (functional/non-functional) 5. Fulfill functional and non-functional requirements 6. Satisfy client business motivations 7. Buy vs. build decisions 8. Maintenance and expected life-cycle of products Constraints and Concerns 9. Viability of solutions 10. Consideration of existing architecture constraints 11. Current IT architecture and capabilities 12. Compatibility with existing systems 13. Prior use of the design and how successful 14. Availability of technology and tools 15. Prototype and staged delivery 16. Time to market 17. Available time 18. Risk These rationales show a variety of factors that influence the design decision making process. They also provide the context to enable architects and designers to trade-off conflicting goals by argumentation. 5.3.4 Using design rationale Another important area of the survey was how frequently design rationale are used. An objective of the study is to discover whether respondents’ perceived importance of design rationale (i.e. what they think) and their behaviour (i.e. what they do) are consistent. Therefore, the same set of design rationale we presented and discussed in the previous sections were used to query our respondents. In this section, we present the results of a 64
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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
Page 31 and 32: 2.1. Industry practice of design ra
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Page 43 and 44: Chapter 3 Related work in design ra
Page 45 and 46: 3.2. Why do we need design rational
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Page 49 and 50: 3.3. Existing methods for capturing
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Page 61 and 62: 3.5. How well design rationale meth
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Page 67 and 68: 4.1. Software engineering research
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Page 73 and 74: on a regular basis. Their inputs ha
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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
Page 95 and 96: 5.4. Discussion of findings or cons
Page 97 and 98: 5.5. Limitations and use design rat
Page 99 and 100: Part III The Representation and App
Page 101 and 102: 6.1. A conceptual model for design
Page 103 and 104: 6.2. Architecture Rationale and Ele
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Page 107 and 108: 6.3. Architecture elements Figure 6
Page 109 and 110: 6.4. Architecture rationale Figure
Page 111 and 112: 6.4. Architecture rationale • ris
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
Page 129 and 130: 7.1. The EFT system not chosen beca
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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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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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