A Rationale-based Model for Architecture Design Reasoning

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9.4. AREL and eAREL traceability applications in a case study Figure 9.4: Backward tracing for root-cause analysis 9.4.3 Tracing architecture design evolution Since architectures can have a long live-span and are subject to enhancements and adaptations over time, the view of the current architecture design does not necessarily provide all the information required for decision making. We use eAREL as a supporting mechanism for evolution tracking. It provides a means to track changes of the design and the decision making over time. Let us consider architecture element C4 2 5 for MAC Processing. In Figure 9.5(a), assuming I1 1 5 and R2 4 6 are the new requirements to support authenticity of the payment message using an encryption mechanism. The implementation requires the MAC code to be encrypted with a secret key to prove its authenticity. So the original design C4 2 5, which only supports clear-text MAC, would require some modifications. We decide to keep its original design history. A copy of the original design, i.e. version 1 of C4 2 5 is archived and a relationship of the stereotype ≪AEsupersede≫ links it with version 2 of the C4 2 5, which is in the current AREL model. This is shown in Figure 9.5(b). Since version 1 of C4 2 5 MAC has now been replaced, its ≪ARtrace≫ links to AR12 and AR13 are now obsolete, therefore these links are made non-current. New ≪ARtrace≫ links are created to be related to 163
9.4. AREL and eAREL traceability applications in a case study (a) (b) Figure 9.5: (a) MAC processing (b) Superseded architecture element AR12 and AR13 for version 2 of the C4 2 5. In the above example, we have demonstrated how a design can be superseded by its replacement. The supersession of AR works in the same way. eAREL can be useful in many cases. For instances, an architect may wish to investigate the extent of design changes in a particular release, or investigate the impact of a historical change, or simply understand the design history as background information. The architect can follow the ≪AEsupersede≫ links to recover the previous designs. The tracing of historical changes to the architecture design begins from an initial AR or AE in AREL, and then trace through its history using ≪ARsupersede≫ or ≪AEsupersede≫ links to the older versions of AR or AE. Finally, the inter-relationships between historical elements and rationale can be traced through non-current ≪ARtrace≫ links. 164
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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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Page 215 and 216: 11.2. Checking AREL models Figure 1
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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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