When adding a user as verifier, You can ensure that the task is completed as expected.

Add A Verifier to a Task (Step By Step)
2. Click on your list. For eg here list "Aram Room Maintenance" has been selected here. Please note that this list is a shared list
3. Lets add a sample task here
6. Click on any of the list members you want to add as a verifier of Task
7. Now once the user completes the task, the verifier will have to mark the task as verified. This adds an additional step to increase accountability within your team. The verifier can make sure that the task is completed in the required manner.