Thisarticlereviewsprogressincooperativecommunicationnetworks.Oursurveyisbynomeansexhaustive.Instead,weassemblearepresentativesampleofrecentresultstoserveasaroadmapforthearea.Ouremphasisisonwirelessnetworks,butmanyoftheresultsapplytocooperationinwirelinenetworksandmixedwireless/wirel