Which aspect allows users to engage with a system while a case is actively being processed?

The aspect that allows users to engage with a system while a case is actively being processed is local action. Local actions enable users to perform specific tasks or make decisions without having to wait for the entire case processing to be completed. This is particularly useful in a scenario where a user can need to provide additional information or make a choice that contributes to the ongoing work on a case.

By allowing these interactions, local actions enhance user experience and facilitate a more responsive and interactive workflow. This functionality is designed to empower users to contribute to case resolution actively while maintaining the processing flow of the overall case.

In contrast, user notifications merely inform users about updates but do not allow for interaction. Optional processes could be part of the case but do not necessarily imply engagement in real-time with the ongoing case. Task assignments direct specific actions to users but do not provide the interactive, flexible engagement that local actions do.