Which of the following tasks cannot be performed by unlicensed personnel under any circumstances?

Unlicensed personnel are restricted from conducting initial evaluations, as this task requires a comprehensive understanding of the patient's medical history, an assessment of their condition, and the subsequent formulation of an appropriate treatment plan. Only licensed physical therapists possess the necessary education and training to evaluate a patient's needs accurately and determine the most effective intervention strategies. This ensures that the quality of care adheres to the professional standards required in physical therapy practice and prioritizes patient safety.

In contrast, the other tasks listed can be performed by unlicensed personnel under certain circumstances. For instance, assisting in therapeutic exercises can be done under the supervision of a licensed therapist, and scheduling patient appointments does not require specialized knowledge in physical therapy. Providing nutritional advice, while generally beyond the scope of practice for licensed physical therapists unless they have specific training or licensure in nutrition, can sometimes be offered by unlicensed personnel as long as it doesn't cross into regulated health advice.