For the Vancouver Public Libraries (VPL), Early Development Instrument (EDI) data has been used over the years for programming and early years staffing decisions to focus on neighbourhoods with higher vulnerability. Recently, EDI data helped inform decisions around which locations to prioritize for renovations to enhance early years spaces and decisions around child care outreach planning (supporting child care programs in certain neighbourhoods with story times, family and early literacy programming and resources). EDI data (and other Monitoring System data as available) are a key resource for advocacy efforts at the local and provincial government level to encourage investment in the quality, low-barrier, equity-oriented services and supports public libraries provide.