Which method is commonly used for diagnosing ADD/ADHD?

The choice that involves testing levels of inattention is correct for diagnosing ADD/ADHD because it focuses directly on the symptoms that characterize these disorders. Attention Deficit Disorder (ADD) and Attention Deficit Hyperactivity Disorder (ADHD) are primarily identified based on observable behaviors and symptomatology associated with inattention, hyperactivity, and impulsivity.

Standardized behavioral rating scales and checklists are commonly utilized in clinical settings to measure and evaluate the frequency and severity of inattention, which is essential for making an accurate diagnosis. These measures often involve input from various sources, including parents, teachers, and sometimes the individuals themselves, providing a comprehensive view of the child's behavior in multiple contexts.

While family interviews, observations, and medical histories can be useful in gathering additional context or ruling out other potential issues, they do not specifically address the levels of inattention necessary for a definitive diagnosis of ADD/ADHD. Hence, focusing on testing levels of inattention directly aligns with the diagnostic criteria outlined in the DSM-5 for these disorders.