Brief Description Business Process: 4.2.2.1 MDM Calculate Usage Process Type: Process Parent Process: 4.2.1 MDM. Manage Bill Sibling Processes: This process is initiated when a usage transaction is created either manually, automatically based on a measurement cycle, or ad hoc by a request from an external application. MDM calculates usage for usage subscribers based on rules defined in usage group(s) that is active during the required usage period. If more than one usage group is active during the period then a sub usage transaction will be created for each of the active periods. Once the calculations for the usage transaction have been successfully completed then the results are sent to the usage recipient either online or by a scheduled batch process.