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Chapter 1 The Product

Chapter 1 The Product. What is Software?. 1) instructions (programs) that when executed provide desired function and performance 2) data structures that enable the programs to adequately manipulate information 3) documents that describe the operation and use of the programs

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Chapter 1 The Product

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  1. Chapter 1The Product

  2. What is Software? • 1) instructions (programs) that when executed provide desired function and performance • 2) data structures that enable the programs to adequately manipulate information • 3) documents that describe the operation and use of the programs • A logical rather than physical system element

  3. What is Software? • software is engineered • software doesn’t wear out • software is custom built • software is complex

  4. Failure (“Bathtub”) Curve for Hardware Infant mortality Wear out Failure Rate Time

  5. Wear vs. Deterioration

  6. Software Applications • system software • real-time software • business software • engineering/scientific software • embedded software • PC software • WebApps (Web applications) • AI software

  7. Software Myths • Management • We have standards • We have new computers • We’ll add more people to catch up • I outsourced it, I’m done • Customer • We have general objectives, let’s start • Change is easily accommodated • Practitioner • We’ll write it and be done • I can’t assess quality until it is running • I only need deliver code • Software engineering is about meaningless documents

  8. The Cost of Change

  9. Software Poses Challenges

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