Provide explicit guidance/options (e.g. a button) in email notices to respond "completed", "delayed", "extend timeline". I this functionality is built in but not clear anywhere in the notices that are sent out.
Thank you for your idea. Email notifications currently include a link to open the record. This makes it quick to view the record and make any necessary updates. Given this capability, we are unlikely to add additional options to the notifications. We hope you can understand.