Towards Sustainable Community Health and Social Welfare Services Leaving No One Behind. This Operational Guideline for Community-Based Health Services (CBHS) in line with the CBHS Policy Guideline map an integrated and coordinated national approach to community-based health services in Tanzania. The approach builds on and furthers national priorities for decentralization, community empowerment and strengthened systems for expansion of access to essential health services at the village level and below.