I want to build a report which shows who is current assignee of the task and who was previous owner of the task.

@ambrishs I don't think there is a capability in the product as of now to report on the previous owner of the task, rather a current owner can be shown. And this capability can't be provided by us if we go with the OOTB 'Reassign task' option(which is present in the left hand pane of 'Tasks' tab when a Task is accessed). Because there isn't a way to capture the 'Reassign task' event.

Previous owner can be captured if Reassign Task functionality is provided by us on the Form (Let's say a button called 'Reassign Task' is added on the form, and clicking this button will surface the reassign options and thereby save the necessary task attributes in the database) or on the Task Report. But this way, we are re-writing the Task Reassign functionality and also we are delegating some logic to database which might seem cumbersome when compared to OOTB process reporting. We have to bear in mind that, we need to disable OOTB 'Reassign Task' functionality for this, as performing it skips the updates which we have to do upon reassigning.

@ambrishs I don't think there is a capability in the product as of now to report on the previous owner of the task, rather a current owner can be shown. And this capability can't be provided by us if we go with the OOTB 'Reassign task' option(which is present in the left hand pane of 'Tasks' tab when a Task is accessed). Because there isn't a way to capture the 'Reassign task' event.

Previous owner can be captured if Reassign Task functionality is provided by us on the Form (Let's say a button called 'Reassign Task' is added on the form, and clicking this button will surface the reassign options and thereby save the necessary task attributes in the database) or on the Task Report. But this way, we are re-writing the Task Reassign functionality and also we are delegating some logic to database which might seem cumbersome when compared to OOTB process reporting. We have to bear in mind that, we need to disable OOTB 'Reassign Task' functionality for this, as performing it skips the updates which we have to do upon reassigning.