“…This is fundamentally different from R&D in most engineering-based industries such as automotive design, semiconductors, computers, and aircraft in which products can only reach a level of complexity comparable to pharmaceuticals on some measures [23]. Furthermore, because so little is known about how the human body works, the causes of drug failure are just as uncertain: The molecule or target may be wrong, the dosage may be incorrect, the intended target may not have been hit, other targets may have been hit, and so on [24]. As a result, it is impossible for drug researchers to develop a so-called 'perfect' drug whose function in human body can be understood with 100% certainty.…”