What permission level should supervisors have to view and start a process but not modify the design object?

To enable supervisors to view and start a process without granting them the ability to modify the design object, the appropriate permission level is Viewer.

With Viewer permissions, users can access process instances and view relevant details, allowing them to monitor and understand the workflow without having the capability to make changes to how the processes are designed. This is crucial in environments where it’s important to maintain the integrity and consistency of the process design while still allowing oversight and operational functionalities for supervision.

In contrast, levels such as Editor would permit modification of processes, which does not align with the requirements stated in the question. Similarly, Administrator permissions grant users full control, including the ability to change processes, which goes beyond simply viewing and starting them. Deny permission would restrict access altogether, preventing supervisors from seeing or interacting with the process. Therefore, Viewer strikes the right balance for the requirements specified in the question.