The WiPC gathers its information from a wide variety of sources and compiles it in its biannual Case List. It seeks to confirm its information through two independent sources. Where its information is unconfirmed, it will either not take action, or it will send an appeal worded to reflect the fact that the information is incomplete. Sources include press reports, reports from individuals in the region in question, reports from other human rights groups, PEN members themselves, embassy officials, academics, prisoners' families, lawyers and friends, exile groups, and international non-governmental organizations.

The WiPC's records of persecuted writers are updated daily. For up-to-date information on a particular case or country, contact PEN American Center or the WiPC headquarters in London. Anyone wishing to take action on any individual mentioned in this Case List should also contact PEN American Center or the WiPC headquarters for any update there may be on the case and for advice on appeals.