The article introduces an 8-point Penetration-Aspiration Scale developed by John C. Rosenbek, Jo Anne Robbins, Ellen B. Roecker, Jame L. Coyle, and Jennifer L. Wood to describe penetration and aspiration events in dysphagic patients. The scale is designed to assess the depth of material penetration into the airway and whether it is expelled. The scale's reliability has been established through intra- and interjudge evaluations. The authors define penetration as material entering the larynx but not below the vocal folds, and aspiration as material passing below the vocal folds. The scale is multidimensional, considering both the depth of penetration and the swallower's response to the bolus. The final 8-point version of the scale is presented, with scores ranging from 1 (no entry into the airway) to 8 (aspiration). The scale is intended to provide a more detailed and reliable tool for clinical and scientific use in understanding the effects of aspiration on dysphagic patients.The article introduces an 8-point Penetration-Aspiration Scale developed by John C. Rosenbek, Jo Anne Robbins, Ellen B. Roecker, Jame L. Coyle, and Jennifer L. Wood to describe penetration and aspiration events in dysphagic patients. The scale is designed to assess the depth of material penetration into the airway and whether it is expelled. The scale's reliability has been established through intra- and interjudge evaluations. The authors define penetration as material entering the larynx but not below the vocal folds, and aspiration as material passing below the vocal folds. The scale is multidimensional, considering both the depth of penetration and the swallower's response to the bolus. The final 8-point version of the scale is presented, with scores ranging from 1 (no entry into the airway) to 8 (aspiration). The scale is intended to provide a more detailed and reliable tool for clinical and scientific use in understanding the effects of aspiration on dysphagic patients.