RT Journal Article SR Electronic T1 MyHEARTSMAP: development and evaluation of a psychosocial self-assessment tool, for and by youth JF BMJ Paediatrics Open JO BMJ Paediatrics Open FD BMJ Publishing Group Ltd SP e000493 DO 10.1136/bmjpo-2019-000493 VO 3 IS 1 A1 Punit Virk A1 Samara Laskin A1 Rebecca Gokiert A1 Chris Richardson A1 Mandi Newton A1 Rob Stenstrom A1 Bruce Wright A1 Tyler Black A1 Quynh Doan YR 2019 UL http://bmjpaedsopen.bmj.com/content/3/1/e000493.abstract AB Background Paediatric mental health-related visits to the emergency department are rising. However, few tools exist to identify concerns early and connect youth with appropriate mental healthcare. Our objective was to develop a digital youth psychosocial assessment and management tool (MyHEARTSMAP) and evaluate its inter-rater reliability when self-administered by a community-based sample of youth and parents.Methods We conducted a multiphasic, multimethod study. In phase 1, focus group sessions were used to inform tool development, through an iterative modification process. In phase 2, a cross-sectional study was conducted in two rounds of evaluation, where participants used MyHEARTSMAP to assess 25 fictional cases.Results MyHEARTSMAP displays good face and content validity, as supported by feedback from phase 1 focus groups with youth and parents (n=38). Among phase 2 participants (n=30), the tool showed moderate to excellent agreement across all psychosocial sections (κ=0.76–0.98).Conclusions Our findings show that MyHEARTSMAP is an approachable and interpretable psychosocial assessment and management tool that can be reliably applied by a diverse community sample of youth and parents.