We are committed to expanding available health data, particularly those that can be linked to foundational population-based data holdings in our Member Organizations. Data that come from different places are often collected to represent similar services or experiences – for example, data about visits with physicians – but are different in how they are collected. Data may also vary in what they include (e.g., because of policies about who is eligible for a service) and what they exclude (e.g., missing meaningful information such as race or gender identity).