Background: Fetal alcohol spectrum disorders (FASD) are associated with neurodevelopmental challenges leading to difficulties with everyday life tasks. The Families Moving Forward (FMF) Program teaches caregivers to use positive behavior support (PBS), integrated with other techniques. However, it is unknown how caregivers retain and use these PBS strategies after the intervention., Methods: About 4.5 months after completing the FMF Program, twenty-three caregivers of children with FASD aged 4-12 were interviewed about problem behaviors targeted during the FMF Program and their continued use of PBS strategies. Interviews were recorded and coded thematically by a five-coder team. Higher-level pattern codes were developed to facilitate themes across descriptive codes., Results: Caregivers commonly targeted task incompletion and rule breaking, and problem behaviors were often complex or combined. Caregivers identified environmental and interpersonal triggers for problem behavior. They used many accommodations to prevent problem behaviors, most often related to task or environment simplification. Caregivers also used consequence-based strategies., Conclusions: This study is the first to characterize caregivers' use of PBS strategies for children with FASD using mixed methods. Problem behaviors such as rule breaking were more difficult to target. Caregivers found most success when using a combination of multiple different accommodations per problem behavior., What This Paper Adds: This is the first study to use mixed methods to characterize how caregivers of children with fetal alcohol spectrum disorders (FASD) use positive behavior support (PBS) strategies to target problem behavior after completion of the empirically validated Families Moving Forward (FMF) Program. Among other techniques involved in the FMF Program, PBS strategies are taught to caregivers and are used to target two distinct, caregiver-identified problem behaviors. This data provides essential information about behaviors responsive to PBS supports, for children with FASD, to inform clinical intervention and research. Notably, multiple problem behaviors often occurred together, emphasizing complexity of behavior challenges in this population and the resulting need for individualized supports. This study is the first to describe commonly observed triggers (antecedents) and commonly used supports (accommodations) from the perspective of caregivers of children with FASD. Importantly, results indicate that use of a wide variety of accommodations, or antecedent-based strategies, are effective in supporting behavior in children with FASD. However, success was most common when caregivers used multiple accommodations for any given concerning behavior. Findings represent 'real-world' strategies caregivers use to support adaptive behavior in their children several months after completion of the FMF Program, suggesting these strategies are applicable to clinical practice., Competing Interests: Declaration of Competing Interest Authors do not have financial or personal relationships with other people or organizations that could inappropriately influence or bias their work. All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all participants for being included in the study. The study from which the original data were drawn was supported by the Centers on Disease Control and Prevention, U84/CCU020163 (Carmichael Olson). Further funding for study support of co-authors Kuhn and Carmichael Olson was provided by the Bernard FASD Family Trust. Importantly, the authors would like to acknowledge research team members, Joanne Sparrow and Amber Sokoloski, based at the Seattle Children’s Research Institute during this project, for their innovative development of the interview measure used in the current study. We are also deeply grateful to the children and families who participated, and to the larger research team who worked so diligently on the original treatment research program. Data are unavailable given the potentially identifying nature of qualitative interview data., (Copyright © 2024 Elsevier Ltd. All rights reserved.)