In addition to E-mail notifications I would like to suggest a pop-up notification using desktop apps letting the users know that they have tasks pending.
E-Mails seem to get lost and don't continually prompt a user to complete their task. Or users might not have access to E-Mail. This should be on option people can mute or turn off.
The pop-up need to be on the icon apps, like others mobile apps (Whatapps...)