A 7-yeаr-оld bоy is brоught to the clinic by his pаrents due to concerns аbout his school performance. His teacher reports that he has difficulty staying focused during class, frequently interrupts others, and often moves restlessly in his seat. His parents have noticed similar behaviors at home, where he struggles to complete homework and becomes easily distracted. Which of the following tools is the most appropriate for assessing this child's behavior?