Imagine that your desktop computer system won't work, and you want to find out why. After checking to make sure that it is plugged in, you experiment with a new central processing unit (CPU), a new monitor (MO), and new system software (SW) in the combinations on the table below. The candidates for necessary conditions and sufficient conditions of failure are the plug position (in or out), the CPU (old or new), the monitor (old or new), and the software (old or new). For each candidate, say (1) which cases, if any, eliminate it as a sufficient condition of your computer's failure and (2) which cases, if any, eliminate it as a necessary condition of your computer's failure. Which candidates, if any, are not eliminated as a sufficient condition of failure? As a necessary condition of failure? Does it follow that these candidates are necessary conditions or sufficient conditions of failure? Why or why not?
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