The tasks from each stage are collated under Tasks on the left panel. Besides viewing a task, you can add a new task, delete, close, trigger, pick up or assign an owner to it. Based on your roles and permissions, you can also edit the tasks.
Under Reminders, you can add, edit, and delete the reminders. You can also modify the status of the reminder.
Under Worklogs, you can record the work hours of technicians associated with the change.
Alternatively, you can add reminders and worklogs via Actions.
You can view all change-related activities under History and filter out the logs by time frames, operations, and fields.