 Working in the causal-mechanical tradition pioneered by Wesley Salmon (1984, 1998), other philosophers turned to understanding mechanism elucidation as the avenue to scientific explanation in biology (Bechtel and Abrahamsen 2005; Bechtel and Richardson 1993; Craver 2007; Darden 2006a; Glennan 2002; Machamer, Darden, and Craver 2000; Sarkar 1998; Schaffner 1993; Woodward 2002, 2010). There are differences between the various accounts of a mechanism, but they hold in common the basic idea that a scientist provides a successful explanation of a phenomenon by identifying and manipulating variables in the mechanisms thereby determining how those variables are situated in and make a difference in the mechanism; the ultimate explanation amounts to the elucidation of how those mechanism components act and interact to produce the phenomenon under investigation. As mentioned above (see  Section 2.1,  see also entry on mechanisms in science), an elucidated mechanism allows for the explanatory features of understanding, prediction, and control.