In black-box testing, the tester should already know something about how the program is implemented so that he/she can more carefully identify what portion(s) of the software are leading to errors.

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In black-box testing, the tester should know nothing about how the software is implemented. In essence, the software is a black-box which has an input and an output and the mechanisms of the program are opaque. If the tester does know something about how the program works, then the tester's test cases might be biased. If the tester knows how the program works, then testing is known as glass-box testing.
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In Black-Box Testing, the Tester Should Already Know Something About