The TOVA Test is a behavioral test for diagnosing ADHD. The software uses a visual test and response and measures the responses to determine self-control, impulsivity, focus and vigilance. The results are tabulated on population aged-normed responses with precise measure of response times (1ms). STG pushed the envelope of timing and accuracy for video refresh and Windows accuracy to support 1ms accuracy. The software included imaging, hardware interface, dongle security, norming evaluation, and a modifiable diagnosis engine that supported clinical updates and findings.