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A Transition defines a link between two structural elements in a workflow where there is no branch.

The SourceOID references the definition of the source structural element for the transition. This can be a StudyEventGroupDef, StudyEventDef, ItemGroupDef, or ItemDef element.

The TargetOID references the definition of the target  structural element of the transition. This can be a StudyEventGroupDef, StudyEventDef, ItemGroupDef, or ItemDef element.

The StartConditionOID references a ConditionDef specifying a condition that must be met for the transition to start. For example  if the source structural element is a StudyEventGroupDef describing the activities for study screening, and the target structural element is a StudyEventGroupDef describing study enrollment,  the ConditionDef referenced by the StartConditionOID specify the criteria that must be met for a subject to transiton from Screening to Enrollment.

The EndConditionOID references a ConditionDef defining the condition under which the transition can be completed. As long as the condition is not met, the transition to the next actitivity or event must be considered to be temporary blocked. When the target structural element can be considered to be a "visit", the condition can be regarded as a visit entry criterion.

When the execution of the transition is depending on a timing constraint that is either directly defined or calculated, a TransitionTimingConstraint must be defined and referencing the current Transition.