Software Design
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This document discusses software design and modeling. It explains that software design involves converting requirements into code that developers can implement. It discusses static and dynamic modeling techniques like class diagrams, use cases, and sequence diagrams. It emphasizes that modeling helps verify requirements, reduce duplication, and streamline the development process. It also discusses scaling models for large applications by breaking them into components, and the importance of communicating the architecture to technical and non-technical audiences.
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Software design
This document discusses various topics related to software design including design principles, concepts, modeling, and architecture. It provides examples of class/data design, architectural design, interface design, and component design. Some key points discussed include:
- Software design creates representations and models that provide details on architecture, data structures, interfaces, and components needed to implement the system.
- Design concepts like abstraction, modularity, encapsulation, and information hiding are important to reduce complexity and improve design.
- Different types of design models include data/class design, architectural design, interface design, and component-level design.
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The document discusses key concepts in design engineering for software. It covers principles like abstraction, refinement, modularity, architecture, and information hiding that are important for developing high quality software. It emphasizes that software design is an iterative process of translating requirements into lower levels of abstraction until implementation. The goals of design are to implement all requirements, provide an understandable guide for developers and testers, and give a complete picture of the software from an implementation perspective. Guidelines are provided for characteristics of good design like modularity, distinct representations, and deriving the design from requirements analysis.
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The document discusses the software design process. It begins by explaining that software design is an iterative process that translates requirements into a blueprint for constructing the software. It then describes the main steps and outputs of the design process, which include transforming specifications into design models, reviewing designs for quality, and producing a design document. The document also covers key concepts in software design like abstraction, architecture, patterns, modularity, and information hiding.
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Prescriptive process models attempt to organize the software development life cycle by defining activities, their order, and relationships. Early models like code-and-fix lacked predictability and manageability. Newer models strive for structure and order to achieve coordination, while allowing for changes as feedback is received. However, relying solely on prescriptive models may be inappropriate in a world that demands flexibility and change.
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This document discusses various topics related to software design including design principles, concepts, modeling, and architecture. It provides examples of class/data design, architectural design, interface design, and component design. Some key points discussed include:
- Software design creates representations and models that provide details on architecture, data structures, interfaces, and components needed to implement the system.
- Design concepts like abstraction, modularity, encapsulation, and information hiding are important to reduce complexity and improve design.
- Different types of design models include data/class design, architectural design, interface design, and component-level design.
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Software Design
- 2. Software Design Conversion of Software Requirements to something that developers can code Software Modelling Model Scaling Communication
- 3. Required Skills Software Engineering Requirements Analysis Communication
- 4. Software Modelling Verify and Understand Requirements Reduce Code and Effort Duplication Streamline Process of Software Development and Test Planning Assist in Agile Development by Providing a Feedback Loop
- 5. Static Modelling All About Class Types Entities Functional Finite State Automata
- 6. Domain Modelling Assume Finite State Automata Use the Project Glossary Hands On: Domain Modelling
- 7. Dynamic Modelling Use Cases Sequence Diagrams This does NOT drive the software structure – static modelling does that.
- 8. ICONIX Process Static Modelling and Dynamic Modelling in Parallel (Probably better to build the static models first) Be aware of your build flow.
- 9. Model Scaling A single domain model is only useful for small applications Requirements Breakdown means Model Breakdown Model Breakdown means Component Architecture
- 10. Model Breakdown Rationalise the Terminology (user/customer/account etc) Build High Level Domain Models Analyse and Isolate Sub-Components Continue to breakdown as required
- 11. Component Architecture SOA or Non-SOA? Separate CRM and eCommerce? Separate Reporting System? Staff Management, HR etc?
- 12. Scale Back Up Convert links between domain objects to links between domain models Define APIs at Model not Object level
- 13. Communicate the Architecture Explain How the Domain Model is Built Map Domain Models to Requirements Explain Terms in Mapping Explain Each Component
- 14. Compartmentalisation Lay Out Requirements into a Diagram Lay Out Models into a Diagram Map the Diagrams Build Domain Models for each Component
- 15. Communication Diagrams Are Not Architecture Communication is Architecture You Have 2 Audiences: Technical and Non- Technical Communicate According to Audience
- 16. Frameworks Frameworks Can Buy Time Time Is Money Incorporate at the Domain Model Stage Make Design Decisions Compatible With the Framework
- 17. Points Of Study Communication Skills Language Skills UML and Software Modelling Frameworks