In this seminar I will discuss the pros and cons of adult ADHD diagnostic tools - i.e. screeners, surveys, and tests. This will include self-report screeners such as the ASRS and WURS, diagnostic self-survey measures such as the CAARS2, observer-based survey measures such as the CAARS2-O, and diagnostic Continuous Performance Tests, such as the CPT-3, TOVA, QB, and Creyos Testing. To increase accuracy and reliability of ADHD diagnosis in adults I will advocate for a diagnostic process that incorporates a battery of complementary tools as an adjunct to traditional psychiatric diagnostic methods based on history taking, observation, and consideration of DSM diagnostic criteria. I will also describe the utility of using a novel symptom measure to track patient progress during follow-up visits, called the HII-5, based on the widely used PHQ-9 for depression and GAD-7 for generalized anxiety. At the conclusion of my talk, attendees will be well-prepared to incorporate quantitative testing into their practice for optimizing both the diagnosis and ongoing management of adult ADHD patients.