The publication series of Communications in Asteroseismology (CoAst) is one of the most important international journals in the field of asteroseismology. Asteroseismology is the science of variable and pulsating stars. Every six months CoAst publishes a newsletter with papers on ongoing research projects. Besides these regular issues, special issues such as conference proceedings or program manuals are published in this series. Volume 157 contains the proceedings of the HELAS Workshop on the interpretation of asteroseismic data, held in Wroclaw, Poland in June 2008. The latest results of theoretical and observational approaches to a large variety of pulsating stars were presented.