topics-in-software-saftey(編輯修改稿)
2024-08-20 15:30 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 erous society. ? “Too much is at stake.” ? “The private sector will regulate itself.” ? “The market will selfcorrect. Bad corporate citizens will be punished by the consumer.” ? Sound familiar? So we get more HPSEs ? BOOM! ? In 1817, UK parliament decides to investigate。 forms a Select Committee to investigate dangers of HPS. ? The Committee remended, among other things, frequent boiler inspections. No one pays attention to the results ? Soon after, the city council of Philadelphia tries to raise an alarm. ? The matter is referred to the state legislature, where is dies. Time marches on ... ? BOOM! ? Between 1816 and 1848 in the US: – 233 steamboat explosions – 2562 human fatalities – 2097 human injuries – $3,000,000 property loss Research ... ? Back in Philadelphia, the Franklin Institute begins a six year investigation on boiler explosions. The US government also kicks in some money. – This is the first US government grant for technology research Research results ... ? The result is a series of reports that: – Expose mon errors and popular myths about steam engines and boilers. – Set out guidelines for design and construction. – Remend that US congress enact regulatory legislation, especially with regard to engineer training and practice. Also ... ? Public pressure in US and UK force laws requiring pensation to victim’s families. ? BOOM! ? Explosions continue! ? Public pressure increases again. ? Newspaper editorials and popular literature reflect growing frustration. Legislation ? Finally, in 1852, US congress passes a law to require certain changes in steamboat boilers. ? This was the first successful US law regulating product of private enterprise. ? Steamboat boiler explosions start to decline! ? ... but unsafe HPSEs are still being used in lootives and heavy industry. Tougher standards ? Later, UK parliament passes very tough standards, which are enforced. ? In 1905, the number of deaths due to HPSE explosions are: – 14 United Kingdom – 383 United States ? Eventually, US follows suit and introduces tough standards as well. “Exploding software?” ? We are now in the puter age ? What are the parallels between HPSEs and safetycritical software systems? Analogies ? Boiler technology lagged behind improvement in steam engines themselves. ? So, too, software engineering lags behind hardware (electrical) engineering. What to do? ? Use timetested, good engineering principles: – KISS, essential services, testing amp。 verification, double amp。 triple checking, safety engineering principles ? Learn to love puters a little less. Our mistrust is fading and this is a bad thing. – Therac25 radiation therapy machine ? Being careful need not stop progress, but we should consider the issues in detail. SE foundations ? There was little scientific understanding of the causes of boiler explosions. ? Similarly, ours is a young disciplin
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