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168 CHAPTER 6. THE RUNTIME ENVIRONMENT Figure 6.18: Resource Calendar Management – Editing an entry was added without ‘repeat’ checked, which means he is unavailable for one continuous period from 29/07/2011 at 9:00 until 31/07/2011 at 17:30. Whether Repeat is checked or not is only relevant if an Until date has also been specified. • (Optional) Enter a percentage workload amount (between 1-100) in the Workload field. A workload of less than 100 means the resource will only be partially unavailable for the specified period. For example, a value of 75 means that the resource may also be allocated as a secondary resource to a task at the same time, if that task only requires 25% of the output of that resource — that is, the resource can be shared across two or more tasks during the same period (an example may be a part-time worker, or a surgical nurse who can work between two operating theatres at the same time). If this field is leaft blank, it will default to 100%. • (Optional) Enter a comment which explains why the group or resource is unavailable for the period. To edit an entry, select it from those listed and click the Edit button. The entry’s values will be copied to the relevant fields in the bottom panel. Edit the values as desired, then click the Save button the save the changes, or the Clear button to reject the changes and return to view mode. If an entry spans more than one day, you must select the first day of the span before you can edit it (a warning message will be displayed if there is an attempt to edit a multi-date entry that is not positioned on its start date). Finally, to remove an entry, select it from the list then click the Remove button.