Introduction

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• what is Software Engineering and why it is needed
• Topics in Software Engineering
• Characteristics of Software
• Recent Advances in Software Engineering

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Software Engineering

What is SE(Software Engineering)

• "the application of a systematic, disciplined, quantifiable approach to the development, operation and maintenance of software." - IEEE Standard Glossary of Software Engineering Terminology
• "An engineering discipline that is concerned with all aspects of software production" - Ian Sommerville
• "Multi-person construction of multi-version software" -David Parnas
• important view of SE is more on how it is produced rather than what is produced

Why SE is needed?

• it's because software development is hard.
• it's important to distinguish easy systems from hard systems. ????

SE becomes more important

• as the demands of software is increased
• and the demands are for larger and more complex SW systems.
• Software costs often dominate system costs.

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Topics in Software Engineering

• Software Development Process
  • Requirement Analysis and Specification
  • Software Modeling
  • Software Architecture and Design
  • Software Development
  • Software Verification and Validation
• Project Management
  • Organization, Tools, Risks
  • Estimation, Scheduling, Planning
  • Quality
• Configuration Management

Software Development Process

• a project whose purpose is to develop a software system is composed of a number of activities; Requirement analysus, Design, Implementation, Testing, etc.
• Software Development Process prescribes the interrelationship among the activities by expressing their order and frequency, as well as defining the workproducts.

Software Modeling

• Model: abstraction of the system.
• modeling is a way to deal with complexity by ignoring irrelevant details.
• it's used for more efficient sharing idea and the results of system analysis and design among clients, system analysts and programmers
• standard for modeling is UML(Unified Modeling Language)

Software Architecture and Design

Software Architecture

• Architectural design is on early stage of the system design process
• it focuses on issues that will be difficult/ impossible to change once the system is built; performance, reliability, scalability, etc.
• it's big picture of a software.

Software Design

• Core concepts in Software Design
  • abstraction, Information Hiding/Encapsulation, SoC(Separation of Concerns), interfaces, modularity
• Measure
  • Cohesion, Coupling
• Principles -SOLID(SRP, OCP, LSP, ISP, DIP), favoring composition over inheritance

Software Verification and Validation

• "Program Testing can be used to show the presence of bugs but never to show their absence" - Edsger W. Dijkstra
• Formal Verification
  • proving and disproving the correctness of a program with respect to a certain specification or property, using formal methods of mathematics

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Characteristics of Software

• Software is invisible.
  • it's hard to understand, analyze and evaluate software
• Software changes as the time goes by.
  • the failure rate decreases as sw is developed, but while useful life time, it gradually increases and rapidly increases as it ages.
• Brook's law
  • adding more workers not necessarily shortens the schedule, even it can lengthens the schedule due to the problem or difficulty appears from the communication

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Recent Advances in Software Engineering

• Data Mining based on SE
• AI assisted Software Tools
• Testing & Verification for AI