In the past few days I've been back behind my computer, reviting away. And I have found an interesting way Revit understands the difference between Select All Instances and Count in schedules.

Today we needed to calculate the number of workspaces placed in an interior design for a client. So we created a furniture schedule with the fileds Family Name, Family Type and Count. In the options we chose not to Itemize Every Instance and sorted by Family and then by Type. So far so easy.

According to the schedule we had 150 workspaces.

But when I went to one if them and used the Right Click > Select All Instances > Entire Project I got 183 selections back.

Wait. What?

Well after some searching it turns out that Select All Instances > Entire Project will select everything and in all Design Options, whereas the schedule will give you the correct count for the selected Design Option.

Just one of those things that are logical from a certain point of view, but not readily obvious.