question about book page numbering

Hi Pierre:

The exception to Peter's answer is in technical document layout, where the words "This page intentionally left blank" are frequently added to the otherwise empty left pages added at the end of chapter so that the next chapter can begin on a facing page. They normally don't have running heads or page numbers (but sometimes people do include them).

If you decide to add those words, create a parent page for it in your template and assign them manually to the blank pages that are still there at the end of the editing cycle. 

~Barb

Usually, in a Book, is it necessary to have a number on the blank pages (the blank pages between two chapters) ?

If I understand well, about the blank pages automatically added by the Indesign Book, InDesign is unable to apply automatically the document  master page on these added blank pages, and I am obliged to do it manually.

When it adds the blank page it's not the Parent Page - it's a page with the None.

If you don't want this - then don't choose Add Blank Pages - turn this off.

And manually insert your blank pages using the Parent Pages.

You can setup a preflight check to check if files are multiples of 4 - which would mean you will be alerted during a preflight check that you probably need to add a blank page.