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Works in virtual classes are organized in worksheets.

<p>

Each virtual class can have up to 64 worksheets, and each worksheet can

contain up to 64 work items. A work item can be any Wims module: exercise,

tool, or other.

</p><p>

Each worksheet has a status. The status of a newly created worksheet is

<em>under preparation</em>, which allows work items be added and modified.

This is the only status under which the worksheet can be deleted. A

worksheet under preparation is only visible by the supervisor.

</p><p>

When the supervisor activates a worksheet under preparation, the sheet

becomes <em>active</em>. It can no longer be modified or deleted, and

participants will be able to work on it.

</p><p>

Each worksheet has an expiration date. Passing this date, it becomes

<em>expired</em>, in which case participants will continue to see it and be

able to work on it, but no score will be registered.

</p><p>

And an expired sheet can become <em>hidden</em>, in which case participants

no longer see it (but it is always visible to the supervisor).

</p><p>

The supervisor can manually switch a worksheet between <em>active</em>,

<em>expire</em> and <em>hidden</em> (in any direction).

</p>