This card, developed by Gavi, can assist with and/or consolidate analyses relating to zero-dose and under-immunized communities in order to identify Gavi investments in a given country. It offers a step by step process with key questions to help (1) identify how many zero-dose children and missed communities there are and (2) why they have not been reached; (3) develop and implement strategies to address supply and demand-side barriers; (4) monitor strategies implemented; and (5) evaluate the effectiveness of immunization programs in reaching zero-dose children and missed communities.