This document discusses multimodal learning analytics (MLA), which examines learning through multiple modalities like video, audio, digital pens, etc. It provides examples of extracting features from these modalities to analyze problem solving, expertise levels, and presentation quality. Key challenges of MLA are integrating different modalities and developing tools to capture real-world learning outside online systems. While current accuracy is limited, MLA is an emerging field that could provide insights beyond traditional learning analytics.