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3.7. Rollup Rule Description
Cluster activities are not associated with content objects, therefore there is no direct way for learner progress information to be applied to a cluster activity. IMS SS provides a way to define how learner progress for cluster activities is to be evaluated. A set of zero or more Rollup Rules may be applied to a cluster activity and the rules are evaluated during the Overall Rollup Process (refer to Section 4.6: Rollup Behavior). Each Rollup Rule consists of a set of child activities to consider, a set of conditions evaluated against the tracking information of the included child activities, and a corresponding action that sets the cluster’s tracking status information if the set of conditions evaluates to True.
Figure 3.7a depicts the structure (if [condition_set] True for [child activity set] then [action]) of a Rollup Rule.
Rollup Rules have no effect when defined on a leaf activity.
Figure 3.7a: Rollup Rule Child Activity Set, Conditions and Actions