The scientific research enterprise is built on a foundation of trust Scientists trust that the results reported by others are valid Society trusts that the results of research reflect an honest attempt by scientists to describe the world accurately & without bias But this trust will endure only if the scientific community devotes itself to exemplifying & transmitting the values associated with ethical scientific conduct On Being a Scientist was designed to supplement the informal lessons in ethics provided by research supervisors & mentors The book describes the ethical foundations of scientific practices & some of the personal & professional issues that researchers encounter in their work It applies to all forms of research--whether in academic industrial or governmental settings-and to all scientific disciplines This third edition of On Being a Scientist reflects developments since the publication of the original edition in 1989 & a second edition in 1995 A continuing feature of this edition is the inclusion of a number of hypothetical scenarios offering guidance in thinking about & discussing these scenarios On Being a Scientist is aimed primarily at graduate students & beginning researchers but its lessons apply to all scientists at all stages of their scientific careers