IDPF, TPI, PBG members

Hi PBG SC,

Here is a collated Excel file form the 3 lists : IDPF, TPI and PBG.

Sorry for my ignorance, but could someone bring me light on the differences between TPI and PBG lists ?
- Some PBG members are not listed in TPI.
Is it because they are W3C full members (the case of Adobe, Hachette, for instance)?
Or they registered to the PBG not through the TPI process?

Also some TPI members are not in PBG.
They may be in PWG, but most of the are nowhere in our Publsihnig@W3C groups…

To be discussed.

Luc