The coding of the studies was conducted in a two-step process. In the first step,
conceptual issues were analyzed and the extent to which studies addressed the
research gaps identified by prominent scholars in the field assessed. In the second
step, the particular methodologies used in the selected studies were scrutinized and
coded. Similar to the review by Finkelstein and Hambrick (1996), selected conceptual
issues include underlying theory, unit of analysis, theoretical level of analysis and
causal logic