The document discusses interventions for students at different levels of development in vocal performance based on an assessment rubric. It provides examples of developmental continua and how to use them to identify a student's zone of proximal development (ZPD) to determine the point of intervention. By analyzing student assessment data in a Guttman chart, teachers can identify general levels of development and anomalies to inform targeted interventions for groups or individuals. The document emphasizes considering each student's whole context to plan appropriate support.