Vertical process merging by reconstruction of equivalent models and hierarchical process merging

Methods, systems and computer program products for improvement of vertical process merging by reconstruction of equivalent models and hierarchical process merging. Embodiments of the invention include a method for identifying and resolving differences between business process models, the method including receiving a first business process model project, identifying a second business process model project, performing changes to the second business process model project, merging the first and second business process model projects, creating a delta model configured to analyze the differences between the business process model projects, wherein an analysis of the differences between the first and second business process model projects are in the form of low-level changes and auto-applying the low-level changes of the first business process model project to generate a new business process model project.