Without R&D, there is no trial/error, experimentation, modification of design, chemical composition or material specifications (how much force can the device handle). For instance, what if airplane cockpit voice recorders (CVR) were not tested so as to ensure that the box protecting the device would survive a plane crash? If it survives a drop from a certain number of feet and the impact does not brake through to the inside, the CVR's shell would "pass" inspection. What if drugs were not tested before available to doctors to prescribe? We would not know about any serious side effects of the drug, people who can not take the drug (because they will react with another drug the person is taking or has kidney or liver failure - since kidneys and liver filter out drugs, alcohol, etc and would therefore make the person's health worse)? What about car airbags? Without testing them out, how do we know they will work the way they are designed to?
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