1. COMPONENT BASED SYSTEMS: A CLASSIFICATION OF ISSUES
Sule Yildirim, 20 mars 2003

2. What is this paper for?
Component-based development offers many potential benefits such as greater reuse and a commodity-oriented perspective of software.
But it raises several issues that developers need to consider.
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3. Component: definition
Software components are units of independent production, acquisiton and deployment that interact to form a functional system.
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4. Issues in a framework
In this article, a set of issues organized within an overall framework that software developers must address for component-based systems (CBS) to achieve their full potential are presented.
Components can take a wide range of forms and sizes.
They should be independent of specific software architectural style.
While objects maybe components, all components are not objects.
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5. Framework helps to achieve the following
Helps transfer the potential of component-based system development into reality.
Brings together disparate perspectives on components.
Begins to identify the key research questions.
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6. Derivation of the framework
Phase 1: The issues and the published material studied.
Phase 2: Identify relevant issues.
Phase 3: Use framework to elaborate ideas.
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7. Software Product Issues
Viewed from the perspectives of:
Component providers
Granularity
Portability
Component Integrators
Component selection(evaluate against requirements)
Interoperability (architecture mismatch, functional deficiencies, quality maintenance)
Combining quality attributes
Maintenance over distributed components
Commmon needs
Predicting limits (i.e. 32 bits problem)
Component description to locate, understand and evaluate
Integrated systems customers
(Should supply well specified requirements)
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8. Software Development Process Issues
can affect one or all viewpoints.
Component providers
Internationalization
Testing practices (make dependencies explicit)
Component Integrators
Requirements and component capabilities trade-offs.
Tool support for component evaluation
Demands for change (from both customers and providers)
Commmon needs
Long term support
Responsibility chain
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9. Business Issues Component providers
Internationalization (on global market- encryption, advertising reg. etc)
Responsibility for quality (limit level of responsibility)
Horizontal versus vertical market
Marketability
Component Integrators
New business opportunities (cheap, well supported products)
Managing a range of contractual styles (different national regulations)
Demonstrating products to potential buyers
Trade-offs (accept an existing component or build an ideal one)
Measuring productivity (new productivity models needed)
Commmon needs
Component redundancy
Payment
Distributed execution
Security and certification
Integrated systems customers
(reliable and well maintained products)
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10. People in Software Development
Viewed from the perspectives of:
Component providers
Component Integrators
Evaluators
Management
Commmon needs
Integrated systems customers
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11. Conclusion Several themes require further research Evaluation
Maintenance
Interaction and integration of commercial and technical factors
Aggregation rules
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