A Rationale-based Model for Architecture Design Reasoning

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6.6. A UML representation of AREL and eAREL sedence link of AR is stereotyped by ≪ARsupersede≫ and the supersedence link of AE is stereotyped by ≪AEsupersede≫. Figure 6.8 shows the relationship in UML. Figure 6.8: AE and AR evolution support in eAREL In the eAREL model, the ≪ARtrace≫ links between superseded architecture elements and rationales are also kept to retain their relationships, i.e. P L \ P L c . This supports a historical trace of previous architecture design decisions. The traceability of historical design and design decisions is discussed in Chapter 9. 6.6 A UML representation of AREL and eAREL AREL and eAREL models are implemented using the UML notation [118]. They use UML stereotype to represent their semantics. We make use of tagged values in stereotype to capture information for AREL and eAREL. The choice of using UML for implementation is due to a number of reasons: • UML is already very popular in software design. Architects can use the same representation and tool to carry out architecture design and record architecture rationales during the design process; • UML has sufficient expressive power to support the rationale-based architecture modelling; • UML is a standard graphical representation understood and used by many software development organisations; • UML has a wide variety of tools which could be used to support the capture and the traversal of the model. Our implementation is built on a UML tool Enterprise Architect [150]. It allows us to extend the semantics of the UML notation by using the profile package to define new 97
6.6. A UML representation of AREL and eAREL stereotypes and tagged values for capturing architecture elements and rationales as well as their relationships. This profile is downloadable from [153]. The details of the UML implementation to support AREL and eAREL are described in the following sections. 6.6.1 The architecture element stereotype We define the AE stereotype as ≪AE≫ to extend the UML constructs such as object and class to support architecture traceability. An extension of the UML construct means that additional attributes and characteristics can be added to the existing UML constructs to help design reasoning. The ≪AE≫ attributes for traceability are implemented as tagged values: • elementID - an unique identification of an AE. • elementVersion - an integer number to identify a version of an element, the highest number is the most recent version. elementID and elementVersion together uniquely identify a version of an element. This is used in eAREL implementation. • elementType - classification of the architecture viewpoints (e.g. business viewpoint). This is used for architecture tracing. • elementSubType - sub-classification within an architecture viewpoint. For instance, the Functional Requirement within the Business Viewpoint. This is used for architecture tracing. • currFlag - the latest version has the flag set to ’Y’ and archived versions have the flag set to ’N’. This is used in eAREL implementation. • lastUpdateDateTime - date and time of last modification. • author - name(s) of the author(s). • documentLocation - the location of any external documents that describe the AE, it could be an URL or a filename with document section references. During architecture tracing, elementType and elementSubType can be used to limit trace results to those defined types that are of interest to architects. The lastUpdateDate- Time and author tags are used for audit trail purposes. The elementVersion and currFlag tags support traceability of evolving AEs. 98
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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
Page 65 and 66: Chapter 4 Research methodology and
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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
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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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A Rationale-based Model for Architecture Design Reasoning

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