Anugrah, E. H. .; Saragih, D. P. .; Zulfiani, Z.; Wahyudi, I. Collaborative Governance Model in the Development of Coconut Shell Charcoal Downstreaming in Banyuasin Regency: JEL Classification: H83, O25, O35, Q01, R58. JMAP 2026, 6, 519-537.