Abstract: The present invention relates to a method of placarding which is characterized in that at least one sheet (1, 1b), preferably of corrugated cardboard, is provided with printed matter on at least one side. It is thereafter provided with at least one score/groove (2) crossing the sheet, about which it is thereafter folded up into an easily transportable unit. At a placarding site the sheet (1, 1b) is then unfolded to its full size and applied in a holder (3, 3b) specially intended for this. The said holder is made to retain the sheet (1, 1b) in that at least one part of an edge area of the sheet is enclosed by the holder (3, 3b). The invention also relates to a system of placarding adapted to this method.