Theories of Policy Implementation: An Overview The top-down and bottom-up synthesis approach: It characterizes theoretical orientations perceiving implementation as process of constituting coalition, structuration, networking, learning or institutionalization, within which various parties in a specific policy domain/area strive to realize a policy, program or project in a contextot complexityThe top-down and bottom-up synthesis approach: It characterizes theoretical orientations perceiving implementation as process of constituting coalition, structuration, networking, learning or institutionalization, within which various parties in a specific policy domain/area strive to realize a policy, program or project in a context of complexity. Theories of Policy Implementation: An Overview