Thank you ! That could do the trick. However I planned to use categories (in fact file names) for the different areas (Personnal, Work, Research, Administrative). If I do as you suggest, I could probably use tags for these areas instead of category...

Clément

2012/9/19 Bastien <bzg@altern.org>
Hi Clément,

Clément Mayet <cmayet@gmail.com> writes:

> Thank you Bastien for your quick answer.
> My understanding of the C-c C-x < command is that you restrict the
> agenda view to one headline (i;e project in our case). How do you use
> the :CATEGORY: property then ? Do you copy the project's name in that
> property (or something shorter that makes you remember wich project
> it is) ?

I use something short, but the top-level headlines are short too.

For example, this is my "Org-mode" project:

* Org-mode
  :PROPERTIES:
  :CATEGORY: Org
  :END:

** blabla
** blabla

--
 Bastien