- computer programming
  - writing code
  - software development
- good developer
  - know lang
  - know how to design program
    - here: OO
- software engineering
  - systematic, disciplined
  - development, testing, maintenance
- software life cycle
  - conception --> operation
  - phases
    - analysis
      - needs of customer
      - feasibility
        - yes --> requirements specification
                  - testable
    - design
      - specification --> design
      - OO: set of classes
    - coding
      - design --> program
      - here: Java program
      - easier than design
    - testing
      - run program
      - varying data sets
      - types (OO)
        - unit: classes individually
        - integration: classes working together
      - debugging: eliminating errors (design and coding)
    - operation
      - use program
      - maintenance
        - make changes
        - additional features
        - undetected errors
        - 70% software cost

Quick Check:
1. Analysis, Design, Coding, Testing, Operation
2. Good design decreases maintenance cost.
3. Debugging is the process of eliminating errors.