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CS6300 SAD - Introductions

Intro and Overview​

The importance of Software Engineer(SE)

The software crisis​

  • Rising demand for software
  • Increasing software complexity
  • Slow programmer's productivity growth

Software process​

  • Waterfall
  • Evolutionary prototyping
  • RUP USP
  • Agile

Software Phases​

  • Requirements engineer
  • Design
  • Implementation
  • Verification & Validation
  • Maintenance

Tools of the trade (software size and complexity)​

  • Development: Punch card to IDEs
  • Language: Machine code -> High Level Languages
  • Debugging: Print lines -> symbolic debuggers

Tools​

  • IDEs
  • VCS (Git)
  • Coverage and verification tools

Life Cycle Models​

  • Waterfall
  • Spiral
  • Rational Unified Process (RUP) - UML
  • Evolutionary prototyping
  • Agile

Barry Boehm Interview​

  • Technology
  • People
  • Product
  • Process

Small projects - Agile

Larger projects - more rigorous approach

Cost of late correction​

Cost of late correction

Requirements​

  • Elicitation: collecting requirements from customers and stakeholders
  • Analysis: study and deep understanding of requirements
  • Specification: pseudo-represented and documented
  • Validation: verify the requirements are correct.
  • Management

Design to specification​

  1. Architecture design
  2. Abstract specification
  3. Interface design
  4. component design
  5. data structure
  6. algorithm design

Implementation​

Four principles

  • Reduction of complexity
  • Anticipation of diversity
  • Structure for validation
  • Use of (external) standards.

Verification & Validation​

Validation: did we build the right system?

Verification: did we build the system right?

  • Unit tests
  • Integration
  • System

Maintenance​

  • Bug reports (corrective maintenance)

  • Feature request (perfective maintenance)

  • Environment change (adaptive maintenance)

  • Regression testing

Software process model​

  • Waterfall - 1956
  • Spiral model - 1986
    • Specific expertise
    • complex
  • Evolutionary prototype
    • Immediate feedback
    • Difficult to plan
  • Rational Unified Process(RUP)
  • Agile: TDD

Lifecycle Documents​

  • IEEE document definition
  • Light-Weight documents

Classic Mistakes​

  • People:
    • Heroics
    • work environment
    • people management
  • Process
    • scheduling issues
    • Planning issues
    • Failures
  • Product
    • Gold plating
    • Feature creep
    • Research != Development
  • Technology
    • Silver-bullet syndrome
    • Switching tools
    • No version control

IDE​

Android​