Task Shifting and Sharing in Indian Mental Health: Four Case Studies Through the Lens of the SHIFT-SHARE Framework

India experiences a wide mental health (MH) treatment gap, with around 0.73 psychiatrists per 100,000 people, and a massive unmet need for common MH disorders. Task shifting and sharing (TS/S), which is moving tasks from specialists to less-specialised providers, offers a solution but lacks systematic implementation guidance. Unlike more procedural clinical tasks, MH care can involve multiple entry points, varied task types, and contexts where, often, trust outweighs credentials. This paper describes TS/S models in Indian MH space, identifying implementation lessons. We undertook a qualitative assessment, using interviews, focus groups, and observations, studying four organisations (cases): with models of CHW-led screening and rehabilitation across 700 villages in rural Gujarat, multi-level community teams operating 80 clinics in coastal Kerala, corporate peer MH first aiders serving 200,000 + employees, and a planned security force nurse counsellor programme. Data were analysed through SHIFT-SHARE v1.0, a new six-stage guiding framework for TS/S implementation, complemented by alignment measures that we developed for cross-case comparison. Organisations developed novel approaches like deconstructing cognitive behavioural therapy (CBT) into shiftable components, engaging traditional healers as collaborative partners, and cross-subsidisation models for sustainability. However, monitoring and evaluation emerged as the weakest link across cases, and funding structures often failed to recognise clinical services, medication, and supervision as important components of TS/S. MH TS/S differs from procedural task transfer: success needs philosophical alignment among providers, community-suitable capacity building, and outcome measures looking at recovery beyond symptoms. Effective MH TS/S means redesigning services around trust and accessibility instead of delegating professional tasks downward.