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The Science of Computing and the Engineering of Software

The Science of Computing and the Engineering of Software. Tony Hoare Europython Birmingham 1 July, 2009. Science Engineering. pure scientist. engineering scientist. . scientific engineer. practicing engineer. Science Engineering. long-term. short-term.

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The Science of Computing and the Engineering of Software

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  1. The Science of Computing and the Engineering of Software Tony Hoare Europython Birmingham 1 July, 2009

  2. Science Engineering • pure scientist engineering scientist .......... scientific engineer practicing engineer

  3. Science Engineering • long-term • short-term

  4. Science Engineering • long-term • idealism • short-term • compromise

  5. Science Engineering • long-term • idealism • certainty • short-term • compromise • risk management

  6. Science Engineering • long-term • idealism • certainty • perfection • short-term • compromise • risk management • adequacy

  7. Science Engineering • long-term • idealism • certainty • perfection • generality • short-term • compromise • risk management • adequacy • specificity

  8. Science Engineering • long-term • idealism • certainty • perfection • generality • separation • short-term • compromise • risk management • adequacy • specificity • integration

  9. Science Engineering • long-term • idealism • certainty • perfection • generality • separation • unification • short-term • compromise • risk management • adequacy • specificity • integration • diversity

  10. Science Engineering • long-term • idealism • certainty • perfection • generality • separation • unification • originality • short-term • compromise • risk management • adequacy • specificity • integration • diversity • best practice

  11. Science Engineering • long-term • idealism • certainty • perfection • generality • separation • unification • originality • formality • short-term • compromise • risk management • adequacy • specificity • integration • diversity • best practice • intuition

  12. Science Engineering • long-term • idealism • certainty • perfection • generality • separation • unification • originality • formality • correctness • short-term • compromise • risk • adequacy • specificity • amalgamation • diversity • best practice • intuition • dependability

  13. The Science of Computing • seeks answers to basic questions • what does a program do? • how does it work? • why does it work? • how do we know?

  14. The Science of Computing • seeks answers to basic questions • what does a program do? described by its specification • how does it work? • why does it work? • how do we know?

  15. The Science of Computing • seeks answers to basic questions • what does a program do? described by its specification • how does it work? by split into modules with defined interfaces • why does it work? • how do we know?

  16. The Science of Computing • seeks answers to basic questions • what does a program do? described by its specification • how does it work? by split into modules with defined interfaces • why does it work? by theory of program semantics • how do we know?

  17. The Science of Computing • seeks answers to basic questions • what does a program do? described by its specification • how does it work? by split into modules with defined interfaces • why does it work? by theory of program semantics • how do we know? by calculation and proof

  18. Science delivers results • as a software engineering toolset covering all phases of software development • specification, design, coding, testing, modification, evolution, ... integrating the services of • program analysers, type checkers, theorem provers, code generators, test case generators, ...

  19. Technology transfer Science of correctness Design automation Program analysis Engineering of dependability

  20. One day ... • Software will be the most reliable component of every product which contains it. • Software engineering will be the most dependable of all engineering professions. • Because of the successful interplay of research • into the science of programming • and the engineering of software

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