Inclusion Criteria:  the child must be between the ages of 3-11 at the time of baseline/pretreatment data collection; the child must have an elevated score based on parent-report on the Inattention and/or Hyperactivity/Impulsivity Symptom Index of the ADHD Rating Scale- 5 (Dupual et al., 2016) the parent/caregiver must be a fluent English speaker; the parent/caregiver must be the legal guardians of and have full-time child care responsibilities for their child (parents/caregiver with limited contact with their child will not have the opportunity to sufficiently practice the BPT skills), the parent/caregiver must have reliable and stable mobile internet access, the parent/caregiver must use an Apple iOS operating system (Myndlift BPT is only available in iOS 9 or above) the parent/caregiver and their child must reside in the United States.  Exclusion Criteria:  the child or parent/caregiver presents with emergency psychiatric needs that require services beyond those that can be managed within this intervention format (e.g., hospitalization, specialized placement outside the home); In this case, an active intervention by research staff to secure what is needed will be made; if the child has an elevated score for Autism Spectrum Disorder on the Developmental Behavior Checklist-Autism Screening Algorithm (youth with ASD often require considerably more intervention; and, if the parent/caregiver is currently enrolled or has recently enrolled in any type of BPT program (i.e., past two years).