Software Engineering

SoftwareEngineering

What is software Engineering? Software engineering is the systematic application of engineering approaches to the development of software. Software engineering is a computing discipline.

“The application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software” (IEEE)

Feature of software: Nonvisible, Changeability, Reproducibility, Complexity

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Software’s life cycle

Project management

1. Start
2. Planning
3. Implementation
4. Analysis
5. Design
6. Implementation
7. Test
8. End
9. Maintenance

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Type of maintenance

Perfective Maintenance: Modification of a software product after delivery to improve performance or maintainability.

Corrective Maintenance: performing identify, isolate, and rectify a fault

Adaptive Maintenance: Modification of a software product performed after delivery to keep a software product usable in a changed or changing environment.

Preventive maintenance: Modification of a software product after delivery to detect and correct latent faults in the software product before they become effective faults.

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Software development process

Build-Fix Model: Just make and fix without design
Advantage: Fast
Weakness: It’s hard to grasp the project.

Waterfall Model

1. Requirements analysis resulting in a software requirements specification
2. Software design
   • Syetem architecture
   • Program architecture
   • User interface
3. Implementation
4. Testing
5. Integration, if there are multiple subsystems
6. Deployment
7. Maintenance

Advantage: Sufficient research and analysis
Weakness: It takes time to check system

Prototyping Model

1. Requirement gathering and refinement
2. Quick design
3. Building prototype
4. Customer evaluation
5. Refining prototype

Advantage: User feedback is well reflected
Weakness: It is hard for developer to management

Spiral Model

1. Planning
2. Risk analysis
3. Build
4. Customer evaluation
5. Repeat until complete.

Advantage: It can prevent technical risk
Weakness: It is complicated

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Project

“A project is a temporary endeavor undertaken to create a unique product or service”(PMI)

Importance of project

• Reduce danger and increase the success rate.
• Manage systematically

Project planning paper: Project parcitipater see this and work
Included content: Task, Activity, Cost, Manager, Time, etc..

UP(Unified Process): Object-orientaton software develop method, Devide software develop step into four section(Inception, Elaboration, Construction, Transition)
Specific: Iterative, Incremental, Based on Usecase, Architecture Centered develop, Focus in error

XP(eXtreme Programming): Develop with customer, Focus on pair programming
Specific: Simplicity, Communication, Feedfack
Action points: Planning game, Metaphor, Small release, Simple design, Test-first development, Refactoring, Pair programming, Collective code ownership, Continuous integration, 40 hour week, On-site customer, Coding standard, Whole team

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Requirements

A condition or capability that must be met or possessed by a system or system component to satisfy a contract, standard, specification, or other formally imposed document.

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Analysis

• Structured analysis
• Object oriented analysis and design
• Use case diagram
• Class diagram

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Software architecture

Architectural pattern

• Division and placement of functions
  • Repository model
    Configuration: Repository, Subsystem Worth: It can manage consistency of data. It is easy to add a new subsystem.
    Weakness: It is possible to develop bottlenecks. It is weak in security.
  • Client-Server model
  • Layering model
  • MVC(Model/View/Controller) model
• control relation
  • Data-Flow model

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Software design