Development and Adaptation of I-STRONG for SCD

Inclusion Criteria: * Diagnosed with SCD (any genotype) * Score of at least 3 (indicating medium to high risk for chronic pain) on the Pediatric Pain Screening Tool * Stable disease-modifying treatments, if applicable, as defined by no newly initiated or significantly increased dosages (mg/kg) in the past 3 months (Aim 2 only) * English fluency (Aim 2 only) Exclusion Criteria: * Comorbid medical conditions typically associated with pain but unrelated to SCD (e.g., rheumatologic disorders or inflammatory bowel disease) * Presence of a condition(s) or diagnosis, either physical or psychological, or physical exam finding that precludes participation (e.g., severe avascular necrosis with limited or non-weight bearing restrictions, significant cognitive or developmental limitations, active suicidal ideation) (Aim 2 only) * Adolescent receiving active treatment (e.g., weekly appointments with a provider) for nonpharmacological therapies (e.g, structured behavioral pain management, physical therapy, or acupuncture program) that overlap with the active phase of the study intervention (Aim 2 only)