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Ruiter, E.J., R.M.J.C. Kleukers & T.J. Verstrael, 2010. Cooperation for dragonflies. Brachytron 13(1/2): 47-54. In 2007 the Dutch Society for Dragonfly Studies (NVL) celebrated its 10th anniversary. For ten years the NVL closely cooperated with Dutch Butterfly Conservation (De Vlinderstichting) and European invertebrate Survey (EIS-NL). This cooperation turned out to be successful and resulted in some remarkable projects. For example: the realization of the atlas on Dutch dragonflies in 2002. This publication appeared as volume 4 in the series Fauna of The Netherlands. Another notable event was the Dutch/German symposium at Kranenburg (Germany) in 2004. Cooperation across borders is one of the main goals of the NVL, because after all dragonflies do not acknowledge borders and conservation is a matter of international importance. At this moment the NVL is involved by the realization of an Atlas on European Dragonflies (Kalkman, in prep.). On a national scale the NVL is working on more ecological knowledge of specific species. In 2002- 2007 the ecology of Sympecma paedisca was studied, resulting in a special edition of Brachytron which presented the results (Brachytron 11 (1), 2007). This publication appeared courtesy of Dutch Butterfly Conservation and EIS-NL. Hopefully, the successful cooperation between the three organizations will be preceded for at least another ten years.