Volume 15 (2011) keeps the international standard of the Targets in Heterocyclic Systems series and contains eleven chapters, covering the synthesis, reactivity and activity (including medicinal) of different heterorings. Written by contributing authors from Belgium, France, Italy, Poland, Portugal, Russia and Spain, the volume provides a valuable international perspective on Heterocyclic derivatives and their consequential role in organic chemistry in the construction of more complicated molecules. Volume 15 (2011) will be welcomed by researchers and industrialists interested in this important aspect of organic chemistry.