Scheduled messages have a wide variety of applications - from notifying a learner of an assignment or welcoming a new addition to the site. For a definition of each application (or "Target") feel free to review the items below:

LEARNER
Learner-Created | When a learner is added to the system
Learner-Modified | When a learner's account information has been changed
Learner-Assigned | When a learner has been assigned to a new Team

CONTENT
Content-Created | When a course is added to the system
Content-Modified | When a course's profile has been changed
Content-Assigned | When a course assignment has been made
Content-Completed | When a course has been completed by a learner
ContentDue-Before | Notifies recipients within a specified number of days, weeks or months before an assignment's due date
ContentDue-After | Notifies recipients within a specified number of days, weeks or months after an assignment's due date

LEARNING INITIATIVE
LearningInitiative-Created | When a Learning Initiative is added to the system
LearningInitiative-Modified | When a Learning Initiative has been changed
LearningInitiative-Assigned | Notifies recipients when a Learning Initiative has been assigned
LearningInitiative-Completed | When a Learning Initiative has been completed
LearningInitiative-Expired | When a Learning Initiative has reached its expiration
LearningInitiative-Before | Notifies recipients within a specified number of days, weeks or months before a Learning Initiative's expiration date
LearningInitiative-After | Notifies recipients within a specified number of days, weeks or months after a Learning Initiative's expiration date
LearningInitiativeDue-Before | Notifies recipients within a specified number of days, weeks or months before a Learning Initiative's due date
LearningInitiativeDue-After | Notifies recipients within a specified number of days, weeks or months after a Learning Initiative's due date

QUALIFICATION
Qualification-Created | When a qualification has been associated with a learner's profile
Qualification-Modified | When information pertaining to a learner's qualification has been changed
QualificationExpiring-Before | Notifies recipients within a specified number of days, weeks or months before a qualification's due date
QualificationExpiring-After | Notifies recipients within a specified number of days, weeks or months after a qualification's due date

Qualification-Complete | When a qualification has been completed with a learner's profile

CLASSROOM
Event-Created | When a classroom event is added within a classroom profile
Event-Modified | When information pertaining to a classroom event has been changed
Event-Completed | When a learner has been marked as having attended/completed a classroom event
Event-Expired | When an event date has passed and is no longer available for registration
EventRoster-Assigned | When a learner has been assigned to an event roster (they did not self-enroll, but the administrator has assigned them to it)
EventSchedule-Created | When an event schedule has been added within a classroom
EventSchedule-Modified | When an event schedule has been changed
EventSchedule-Before | Notifies recipients within a specified number of days, weeks or months before a classroom schedule
EventSchedule-After | Notifies recipients within a specified number of days, weeks or months after a classroom schedule

APPROVAL REQUESTS
ApprovalRequest-Created | When a approval request has been submitted and is pending a response
ApprovalRequest-Completed | When a approval request has been approved/denied
ApprovalRequest-Before | Notifies recipients within a specified number of days, weeks or months before the automated response ("Default Action") kicks in for a approval request