This brief is part of a series of three briefs which aim to document technical assistance (TA) within the DFID-funded Technical Assistance for Nutrition (TAN) programme, particularly exploring best practices and lessons learned from TA provision. The first brief considered TA ways of working within the TAN project, and the second brief explores the landscape of TA provision by the TAN partners. This, the third brief, documents different aspects, best practices and lessons learnt from TA provision from the TAN programme.