This document discusses interactions in learning environments that use IMS Learning Design specifications. It analyzes how pedagogical aspects are expressed at runtime in IMS LD players. The authors selected the SLeD player and analyzed several real-world learning designs to identify support for and obstacles to different interaction types, such as student-student and student-teacher interactions. Challenges included unclear instructions for collaboration, roles that were not separately identifiable by teachers for support purposes, and complex mappings of roles to learning paths. The analysis aims to inform improvements to IMS LD runtime environments.