The publication series Communications in Asteroseismology (Co Ast) 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 Co Ast 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 156 contains publications on a wide variety of pulsating stars at diverse evolutionary stages that have been analysed on the basis of photometrical or numerical techniques. These include a paper on the first detections of the Co Ro T satellite, which started to operate almost one year ago. The last article in this issue contains a report of the European Helio- and Asteroseismology Network (HELAS) where activities and future plans concerning the european asteroseismology are presented.