The purpose of this Request for Proposals (RFP) is to enter into a Long Term Agreement with successful bidders and select suitable contractors to carry out the following: Providing support to national health authorities, WHO Country Offices and WHO Regional Office for Europe to plan and implement work related to behavioural insights and the cultural context of health behaviours, including as described in the WHO Tailoring Health Programmes (THP) approach - as well as corresponding topic-specific documents: Tailoring Immunization Programmes; Tailoring Antimicrobial resistance Programmes; Tailoring immunization programmes for seasonal influenza (‎TIP FLU) The establishment of Long Term Agreements (LTAs) seeks to support these efforts and ensure expert services are available. Kindly find further details in the RFP document.