Some manufacturers say they concentrate on providing a wide range of features rather than on making the machines easy to use. But that gives rise to the question, "why can’t you have features that are easy to use?" The answer is you can.
Good design practice is a mixture of specific procedures and general principles. For a start, designers should build an original model of the machine and try it out on typical members of the public-not on colleagues in the development laboratory. Simple pubic trials would quickly reveal many design mistakes. In an ideal world, there would be some ways of controlling quality such as that the VCR must be redesigned repeatedly until, say, 90 percent of users can work 90 per cent of the features correctly 90 per cent of the time.
36 . The author had trouble operating his VCR because ______.
A) he had neglected the importance of using the timer
B) the machine had far more technical features than necessary
C) he had set about using it without proper training
D) its operation was far more difficult than the designer intended it to be
31 . According to the author, manufacturers ______.
A should add more useful features to their machines
B) often fail to make their products easy to use
C) should make their appliances as attractive as possible
D) often fail provide proper training in the use of their products
38 . It seems that manufacturers will remain reluctant to make improvements unless ______.
A) they can do so as a very low cost
B) they find their machines hard to operate
C) they have difficulty selling their products
D) they receive a lot of complaints about their machines
39 . According to the passage before a VCR is cold on the market, its original model should be tried out _______.
A) among ordinary consumers who are not technically minded
