Cooperation can exist at many levels. Professors cooperate with students in learning. Co-authors
cooperate on papers and books, often across large distances in space and time. And sometimes
even societies cooperate.
For many years, SIGMOD has co-sponsored conferences, and is in-cooperation with a somewhat
larger set of conferences (see http://www.acm.org/sigmod/sigmodinfo). Won Kim, the previous
SIGMOD chair, provided the impetus to start two regional chapters, the SIGMOD Japan Chap-
ter and the Moscow ACM SIGMOD Chapter. Over the last few years, the SIGMOD Executive
Committee has been active in establishing liaisons and joint projects with a wide variety of bodies
involved in database research.
Here we celebrate this cooperation by providing summary information on nine societies with which
SIGMOD cooperates, our "sister societies". It is to the credit of these societies that they are
open to, indeed, enthusiastically supportive of, joint activities, in a shared desire to best serve the
database community. And SIGMOD looks forward to additional initiatives that will build on the
particular resources of each society to further database research and development.