Study of the Collaborative Life Skills Program

Inclusion Criteria: * Attending a participating school and in 2-5th grade * Referral by LSP as a child with apparent ADHD-related problems * ≥ 6 symptoms (item score ≥ 2) of Inattention or Hyperactivity-Impulsivity on the pooled parent and teacher Child Symptom Inventory * ≥ 3 on the Impairment Rating Scale by parent and teacher (cross-situational impairment) * FSIQ or VIQ ≥ 80 (necessary for cognitive demands of the child skills curriculum) * Caretaker consents to participate in treatment, child assents to participate Exclusion Criteria: * Presence of conditions that are incompatible with this study's treatment. * severe visual or hearing impairment, * severe language delay, * psychosis, * pervasive developmental disorder * Parent or child does not read or speak English or does not read or speak Spanish for our Spanish language implementation of CLS (inability to complete assessment measures or participate in group treatments). * Child is in an all-day special education classroom (children in these classrooms are frequently receiving intensive behavior modification programs such that the intervention would be expected to require modification for use in these settings) * Children taking psychotropic medication for any reason other than to treat ADHD * Children planning to change (start or stop) psychotropic medication * Children who have changed a regimen of psychotropic medication (started or stopped) within 30 days prior to screening