System and method for session synchronization with independent external systems

System for providing data synchronization comprising a data store, a session comprising a user interface and arranged for accessing a stored dossier stored in said data store and at least an external system characterized in that it comprises a synchronizer in communication with at least the session and the data store, the system being characterized in that it is arranged to perform the following steps with at least one data processor:

• the synchronizer receives a request from the session to retrieve the stored dossier from the data store;
• the synchronizer retrieves the stored dossier from the data store, creates from the stored dossier an intermediate dossier comprising at least the content of the stored dossier and delivers the intermediate dossier to the session, as a session dossier, for operations by the user;
• receiving external data from the external system,
• the synchronizer receives user updates that are performed on the session dossier,
• the synchronizer updates the intermediate dossier so that the intermediate dossier comprises said external data,
• modifying the stored dossier so that it comprises said external data and saving the stored dossier in the data store,
• the synchronizer updates the intermediate dossier through merging said user updates and the intermediate dossier;
• and then provides the user with the intermediate dossier as updated.