Attention Deficit Hyperactivity Disorder is increasingly diagnosed among school-aged children, and many are identified for special services, including behavior support. This course is the first in a series of four which will guide attendees through processes to specify which skills are missing in a given child. Recommendations are made for improving assessment through composing interview questions, designing direct observations, and structuring environmental manipulations in order to improve accuracy of data collected. Within each behavior class, tips are given for matching interventions to assessment results. Applicable research resources are provided as well.