A method for continuously forming stacked article groups, comprising the steps of supplying at least two streams of articles, each at a predetermined vertically distinct level; forming and longitudinally transporting a stream of first article groups having at least one article, at a first level; placing a support base on a top surface of each first article group; and forming a second article group, having at least one article, at a second level on top of the support base of each longitudinally moving first article group, whereby stacked article groups are formed. The stacked article groups are subsequently processed for packaging.