SUMMARY A boundary-spanning approach to practice traverses barriers to give social workers greater understanding of context, more latitude in interventions, and increased access to systems. This broad-based approach helps social workers work in large, complex systems of care that demand more creativity and advocacy from practitioners in less time with less support. It draws from direct social work practice, program planning and management, social work administration, and business/organizational management. Spanned boundaries include those restricting knowledge bases and definitions of setting, those separating health from mental health, those that isolate systems of service delivery and levels and modalities of practice.