Preface

This two-volume proceedings contain the papers presented at CSP 2012: 21th
international Workshop on Concurrency, Specification and Programming held
on September 26-28, 2012 in Berlin.
    The workshop has been organized since the early seventies alternatively by
Warsaw University and Humboldt-University (since 1993 as CSP) . Over the
time, it has been extended from a bilateral seminar to a meeting attended also
by colleagues from other countries than Poland and Germany.
    Presently there are 73 participants from 10 countries. Following its tradi-
tion, we strive to retain an informal working atmosphere. Therefore, the call
for papers welcomed drafts and extended abstracts, as well as, fully elaborated
contributions.


August 30, 2012                                    Louchka Popova-Zeugmann
Berlin