In this book, The purpose is confirming software operation in medical device.
Medical device can directly accessible to the patient or operator(Doctor nurse and other).
Therefor, Safety are important more than anything(Safety first). What happen when
the software error? Just the sample, Opertor just control input is 10Volt but Software in equipment
just output value more than input.So patient to recieve a highvoltage.Maybe patient can injury and death.
If you test software corverage, you can confirm the software operation that safety and application.