The author notes that many studies have used individual-level variables to predict a tendency of scientists to aspire to managerial careers, and proposes that a better understanding of such career progression would include structural and organizational factors. Individual factor did indeed explain much aspiration. The new structural variables added explanatory power, but only in growing organizations. Individual factors may be useful in hiring decisions, while structural factors have implications for design of the R & D structures. This TR was published by the author (1988).