Abstract: A machinable index divider having an integral pocket is made from a single piece of paper or other printable, flexible and resilient sheet material. The index divider is included as part of a collated set having between five and twelve index dividers with tabs aligned along one edge; each divider is a one-piece structure including a pocket formed from a bottom flap; the pocket is closed on the sides and bottom and opens upwardly. The pocket opening is disposed approximately mid-way between the panel top edge and bottom edge. Preferably, the panel has two or more perforations aligned in close proximity to the left edge. The right edge has a protruding tab area and a recessed pocket edge area. A tab member bearing preprinted indicia protrudes from the tab area on the panel right edge. A method for making the divider includes a number of steps; first, an unfolded blank is cut using a steel rule die to leave a protruding area along the right side.