Key informant interviews. We will conduct key informant interviews to inform our understanding of needs through key informant interviews with stakeholders working in HIV policy, product regulation and HIV implementation. Approximately 45 participants will be selected purposively through snowball sampling for the KIIs. MLW-LSHTM, using their professional networks and PSI country staff, will identify appropriate stakeholders. Interviews will be with written informed consent, will use semi-structured questionnaires and will be audiotaped.