This document discusses the need for data interoperability to enable lifelong learning analytics. It notes that currently most learning analytics focus on understanding and optimizing formal learning environments rather than the learner perspective across multiple contexts. The lack of interoperability between different education systems means data is often stored in incompatible ways, making analysis difficult. The document proposes using open standards like xAPI to better link learning data across systems and support personalized, lifelong learning through interoperable analysis.