Developed under the USAID-supported HRH2030 Capacity Building for Malaria (CBM) initiative, this guide offers a comprehensive framework for advising National Malaria Control Programmes (NMCPs) through the use of long-term technical advisors (LTTAs). It sets out key practices for implementing partners and advisors, covering advisor selection, onboarding, contextual analysis and capacity-building strategies at individual and organisational levels. It emphasises collaborative work planning, continuous performance monitoring, stakeholder engagement and the use of assessment tools such as the Capability Maturity Model (CMM) and the Organisational Development Assessment (ODA). The guide is designed to strengthen the leadership and operational effectiveness of NMCPs, promoting sustainable improvements in malaria control through structured mentorship, knowledge transfer and strategic partnerships.