m11 software reliability

m11 software reliability - t Ac ian r ita Focus l i Ut Cr...

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1 Social Contract Act Utilitarian Rule Utilitarian Motivation Focus Criteria Module 11: Program abort!
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INTRODUCTION 2 The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair. - Douglas Adams, Mostly Harmless
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INTRODUCTION 3 Computer Reliability Hardware malfunction Data-entry and data-retrieval error Model inaccuracy Software errors
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Data-Entry or Data-Retrieval Errors 4 Data-entry – incorrect data entered Data-retrieval – misinterpretation of data 2000 election– 1000s of voters id’d as felons and disenfranchised False arrests based on retrievals
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Accuracy of NCIC Records 5 March 2003 – FBI not required to ensure accuracy of NCIC db information No way to verify in timely manner If verified would reduce number of criminals arrested BUT Innocent citizens affected by inaccuracies
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Accuracy of NCIC Records: Auto DB 6 1 Mil autos stolen every year Emotional stress Financial loss Insurance rate increases Half of cars recovered – assume 10% by NCIC 50K cars returned due to NCIC False arrests rare What do you think? Which is better argument?
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Software and Billing Errors 7 System Malfunctions Thai minister trapped by BMW We know these System Failures Fully computerized ambulance dispatch (20 people died) LA County Lab System Crew assignment (Comair-1100 flights) Malaysia Airlines – 45 sec to regain control
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Software and Billing Errors 8 Amazon.com shut down British website after offering to sell iPaq handheld computers for L7 (usually 275) Bargain hunters flocked there but Amazon refused to sell at offered price Was Amazon.com wrong to refuse to fill the orders of these people?
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