The mother of an 8-year-old boy brings the child to the psychiatric-mental health nurse practitioner for an evaluation. She states that she thinks her son has ADHD. The mother says the boy’s father is reluctant to try medication and believes the boy just needs to “focus.” The mother wants to try medication and somehow show the father that it will help her son. Which of the following is a tool that could be used to objectively measure behavior changes prior to and during medication administration?