An adaptive integration activity management framework for on demand business process integration provides a mechanism to enable easy integration of legacy and new applications. The framework minimizes the effort need to integrate a new application into an existing business process environment such that the new activity is a "plug-in" into an action manager by implementing a standard adaptation layer. Activity integration is implemented in the principle of "on-demand" because it is invoked as required, so the communication and collaboration between partners become much more flexible.