As the resource has its Saturday and Sunday off in its calendar, these days are shown as blank days and the resource will not work on these days. If we look at resource usage profile now, note that the assigned resource will work 8 hours a day from Monday, 2-Jan to Friday, 13-Jan.
![what is primavera p6 what is primavera p6](http://drmcnatty.com/wp-content/uploads/2017/04/understanding-primavera-p6-histograms-5.jpg)
Now if we change the activity type to resource dependent, note that original duration is changed to 12 days and activity will now start on 02-Jan-17 (Monday) and after consuming 10 days of assigned resource, it will finish on 13-Jan-17 (Friday). This means that by keeping the activity type as task dependent, we are forcing the assigned resource to use the activity calendar. As the resource has its Saturday and Sunday off in its calendar, these days are shown as red or over allocated units of the resource. If we look at resource usage profile, note that the assigned resource will work 8 hours a day from Sunday, 1-Jan to Tuesday, 10-Jan. Note that activity starts on 01-Jan-17 (Sunday) and after consuming 10 days, it finishes on 10-Jan-17 (Tuesday). However, activity type is still task dependent. This activity has also a resource assigned to it which has 5 days calendar and it will not work on Saturday and Sunday. In the picture below, an activity has a type of task dependent and it is assigned a 7 days calendar. In case there are more than 1 resource assigned to a resource dependent activity, primary resource calendar will be used in calculations. For example, if excavation in foundations is assigned a 7 days calendar but the excavator which has to do the excavations is available only 5 days a week then start and finish dates of this activity will be calculated from 5 days calendar (if the activity type is resource dependent).
![what is primavera p6 what is primavera p6](https://tensix.com/wp-content/uploads/2020/01/Oracle-Primavera-P6-Professional-19.12.jpg)
Activity calendar will not be used unless there are no resources assigned to that activity.
![what is primavera p6 what is primavera p6](https://i.ytimg.com/vi/vR_RLypQElk/maxresdefault.jpg)
Resource dependent activity is an activity which uses resource calendar to calculate start and finish dates.