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8.1

CptS 401 Adam Carter. 8.1. Announcement. Executive decision: no class Thursday! (CH 8.3-8.4 and exam review will take place tomorrow instead ) Be sure that you submit a digital copy of your final submissions! Failure to do so may result in a reduced grade. Quiz Question.

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8.1

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  1. CptS 401 Adam Carter 8.1

  2. Announcement • Executive decision: no class Thursday! (CH 8.3-8.4 and exam review will take place tomorrow instead) • Be sure that you submit a digital copy of your final submissions! • Failure to do so may result in a reduced grade

  3. Quiz Question The cause of computer system failures can be attributed to • Faulty design • Slow computers • A & B • None of the above

  4. Answer • A “…faulty design, sloppy implementation, careless or insufficiently trained users, and poor interfaces” (405)

  5. Quiz Question The following is not a factor that contributes to the problems that computer databases cause for people: • A large population • Automated processing without human intervention • Inaccurate biometric data • Errors in data entry • Lack of accountability for errors

  6. Answer: CSeveral Factors Contribute to Database Problems • A large population (many with similar names) • Automated processing can’t always recognize special cases or doesn’t use common sense • Overconfidence in accuracy of data • Human errors in data entry • Data are not updated or maintained • Humans aren’t accountable for problems (blame it on computer!)

  7. Quiz Question In the context of Ch. 8, RSI stands for • Redundant System Inputs • Recalibrated System Integrity • Repetitive Safety Isometrics • Redundant Safety Information • None of the above

  8. Answer: RSI = Repetitive Strain Injuries (E)(see gray box on p. 411) • Have you experienced pain from using a keyboard or mobile device for extended periods of time? A: Yes B: No

  9. Quiz Question A strategy mentioned by the book for making electronic voting machines less vulnerable to fraud and sabotage is • requiring the machines to be housed in a locked cabinet • requiring the software they use to be public • keeping the software they use secret • All of the above • None of the above

  10. Answer • B (416) • Is having open-source software on voting machines a good idea?

  11. Quiz Question The book discusses the failures of complex computer systems at three different airports. What was a common reason all three failed? • They had not undergone sufficient testing • They were unable to handle incorrect user input • They were too complex to work properly • None of the above

  12. Answer • A (419) • The book implies that all three systems were rushed. • Do any of our students from Hong Kong remember the airport incident there?

  13. Quiz Question • In the past 10 years, the number of fatal accidents in relation to total flights • Has gone up • Has gone down • Has stayed the same

  14. Answer • B (424)

  15. Discussion • Has anyone in this class been the victim of computer error?

  16. Class Discussion • Do software errors worry you?

  17. Discussion • So far, the Daemon’s plans have executed perfectly. Given what we know about software failure, does this seem likely?

  18. Discussion • The book provides several examples of people placing complete trust on computer results. Is this a positive (good) trend? • Yes • No

  19. Discussion • The book mentions that at the time of the writing (2008), 30,000 people have been falsely identified as terrorists. More than likely, this number has gone up. • Given that there are probably significantly less than 30,000 terrorists in the world, do our precautions work?

  20. Discussion • Y2K : Real or hype?

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