A Digital Thread is a graph whose nodes are elements in various enterprise repositories, tools, and version control systems, and whose edges are intra-model relationships within each tool and inter-model relationships created and managed by Syndeia between the nodes. Syndeia provides model transformation services to build the digital thread graph, such as drag-n-drop requirements from Jama or DOORS-NG to SysML, generate Simulink models and PLM part structures from SysML models, connect behavior elements in SysML to software code in GitHub, or track the development status of a sub-system in JIRA directly from SysML. Syndeia provides services to search, compare, and bi-directionally synchronize connected models in the digital thread, such as compare and sync changes in system architecture to PLM part structure, compare connected SysML and Simulink models, or sync changes in DOORS-NG requirements to SysML.