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Look-Ahead Sequencing applies to SCORM 2004. When a navigation event occurs, for example Next, Back, Suspend, Exit, Abandon, etc., the TOC is regenerated causing the entire SCORM 2004 class structure to be read. For each activity in the class, it simulates a Choice navigation request. If the simulation results in the activity not being delivered, that activity is disabled or hidden from the TOC depending if there are any SCORM 2004 pre condition rules that result in the activity being disabled or hidden. If the simulation results in the activity being delivered, that activity is enabled in the TOC for the user to launch.
The look-ahead sequencing is configurable. By default, it is enabled and the LearnCenter Admin can disable it, which results in all activities to be available in the TOC. If the feature is disabled, when the user clicks on an activity in the TOC, it attempts to deliver the activity to the user. If the activity fails to deliver due to sequencing limitations, for example controls, rules, etc., a message is displayed to the user that the activity is not valid for delivery.
The user is given another opportunity to choose another activity until they choose one that is deliverable. The following example represents a TOC with look-ahead sequencing enabled. As you can see, activity SCORM Diagnostic SCO Cluster B is not available due to the result of the simulated choice request performed against it. The control mode does not allow 'flowing' to the next activity so clicking on the cluster activity is invalid since it cannot flow to its first child and cluster activities do not have associated content.
They are containers. The result indicated that the activity is not valid for a choice request and it should be disabled.
The following areas allow the Admin to change the behavior of the feature:
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