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The effectiveness of classroom control systems in a traditional classroom environment

The source materials are supplied in continuous strips of cardboard situated initially in separated planes laterally offset from each other. Longitudinal grooves are made along the strips, dividing them into longitudinal bands. The strips are overlapped and glued under pressure to join them together. Once glued they are cut into pieces. The pieces constitute the folded dividers, made up of sections and folded and glued sections which form the union between the sections of each strip. Optionally, narrower sections are glued directly onto the sides of a box, or to sheets glued in their turn to the sides of the box. The upper edges of the divider can be straight or present recesses. The divider formed by strips glued by the sections which make up sections at right angles to the strips is folded and unfolded at the same time as the box into which it is fitted.