A user with editor security rights to a process model cannot perform which of the following actions?

A user with editor security rights to a process model has the ability to make significant changes, but there are certain limitations regarding control over task assignments. This means that while they can modify many aspects of the process, they cannot override task assignments, which involves altering who is responsible for completing tasks within that process. This restriction ensures that task ownership is properly maintained and that the right individuals are accountable for specific actions within the process.

In contrast, the other actions listed—changing the process model name, adding new process variables, and deleting tasks—are within the capabilities typically granted to someone with editor security rights. Changing the name helps in the organization and identification of the process models, adding new variables is essential for accommodating additional data needs, and deleting tasks can be necessary to streamline the process flow. Therefore, while editor rights provide ample control over many aspects, the specific limitation on overriding task assignments is crucial for effective process management and accountability.