Large and complex safety cases are easier to manage when they are broken down into sub-system safety cases or modules. This helps in the identification and isolation of areas where the change applies and also allows the development of the safety case by different teams.

Using the DSM, a template file is produced that contains the correct data field formats required by safety case managers and their teams.  For example hazards will need to have the same data fields whether in the high-level safety case or in the sub-system safety case.  So in the modular safety case template, the user can add or adjust the data fields sitting behind hazards and other entities. Analytical queries, matrix & report structures and look-up tables can also be included in the template.  Once the standard template is produced it can be sent to team leaders to build their part of the modular safety case and imported back into the high level safety case as a separate package for review and analysis.