After failed attempts at creating defence (European Defence Community) and political communities (European Political Community), leaders met at the Messina Conference and established the Spaak Committee which produced the Spaak report.
在防禦（歐洲防衛共同體，European Defence Community）和政治（歐洲政治共同體，European Political Community）共同體成立失敗之後，各國領導人召開墨西拿會議（Messina Conference），成立斯巴克委員會（Spaak Committee），並發表斯巴克報告（Spaak report）。