Problem: One advantage of the black box technique is that no programming knowledge is required. Whatever biases the programmers may have had, the tester likely has a different set and may emphasize different areas of functionality. On the other hand, black-box testing has been said to be "like a walk in a dark labyrinth without a flashlight." Because they do not examine the source code, there are situations when a tester writes many test cases to check something that could have been tested by only one test case, or leaves some parts of the program untested.
What is a good reason to have testers and developers separate?
The answer is the following: tester likely has a different set and may emphasize different areas of functionality

Problem: Resorting to this verbal device, however, did not protect the "Ancient Near East" from the inroads of "the Middle East." For example, a high point in the use of "Ancient Near East" was for Biblical scholars the Ancient Near Eastern Texts relating to the Old Testament by James Bennett Pritchard, a textbook of first edition dated 1950. The last great book written by Leonard Woolley, British archaeologist, excavator of ancient Ur and associate of T.E. Lawrence and Arthur Evans, was The Art of the Middle East, Including Persia, Mesopotamia and Palestine, published in 1961. Woolley had completed it in 1960 two weeks before his death. The geographical ranges in each case are identical.
Who excavated ancient Ur?
The answer is the following: Leonard Woolley

Problem: In 2004, worldwide sales of audio CDs, CD-ROMs and CD-Rs reached about 30 billion discs. By 2007, 200 billion CDs had been sold worldwide. CDs are increasingly being replaced by other forms of digital storage and distribution, with the result that audio CD sales rates in the U.S. have dropped about 50% from their peak; however, they remain one of the primary distribution methods for the music industry. In 2014, revenues from digital music services matched those from physical format sales for the first time.
What has caused a decrease in CD sales?
The answer is the following: other forms of digital storage

Problem: This is not to say that Whitehead's thought was widely accepted or even well-understood. His philosophical work is generally considered to be among the most difficult to understand in all of the western canon. Even professional philosophers struggled to follow Whitehead's writings. One famous story illustrating the level of difficulty of Whitehead's philosophy centers around the delivery of Whitehead's Gifford lectures in 1927–28 – following Arthur Eddington's lectures of the year previous – which Whitehead would later publish as Process and Reality:
What is the general opinion of the difficulty level of Whitehead's work in philosophy?
The answer is the following:
generally considered to be among the most difficult to understand in all of the western canon