- No function at all ("total failure")
- Quantitative deviation (it does the right thing but in the wrong amount, too little or too much)
- Time deviation (it does the right thing but too early, or too late, or it misfires somehow)
- There is an unintended or undesirable function
- There are impermissible side effects (noise, heat, radiation)
“How many kinds of failure are there,
now?”
The trainer asked us, reading from the
screen.And answered, “Five — it all depends on how
“The non-fulfillment of the function’s seen.”
“There’s total failure: nothing’s done at all.
“Then quantitative: little or too much;
“Early or late; wrong functions great or small;
“Or side-effects, like noise and heat and such.”
I harbor all of these deep in my heart:
The sluggard who just dreams, I know him well;
The one who does it backwards, end to start,
Who’s thoughtless, and whose voice clangs like a bell.
For every type of failure we define
Is surely one that I can claim as mine.
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