This is one of the principles of testing given by ISTQB. It says that if a system built is unusable from user point of view then there is no use of testing it and finding faults and fixing them. The system built should be in accordance with the user requirements. In other words we can say that customers are more interested in the usability of the software rather than getting a error-free software. The system developed should help them in completing their tasks effectively and efficiently. For the customers usable software is more important than a error free software. The people and organizations who buy and use it to aid in their day-to-day tasks - are not interested in defects or numbers of defects, except when they are directly affected by the instability of the software.
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