TEST will publish a special issue of the journal with papers presented at IWFOS 2011. Papers can be submitted for this special issue using TEST submission website: http://www.editorialmanager.com/seio/. Authors should include at the beginning of the submission letter (to be typed using the electronic submission system) the phrase "Special issue IWFOS 2011" followed by "Paper # nn", where "nn" is the paper number according to the IWFOS 2011 proceedings. The deadline for submissions to this special issue is December 18th, 2011. Please note that only papers of registered authors who presented a contributed or invited paper at the conference will be considered for possible publication in this TEST special issue. Papers submitted to this special issue will follow the standard reviewing process of regular papers submitted to TEST. Accepted papers will be jointly published in a single TEST issue.