This document discusses PI planning for agile release trains. It begins by defining PI planning as a cadence-based, face-to-face event that aligns teams to a shared mission and vision. It notes when PI planning typically occurs and its goals of commitment, alignment, fast decision making, and cross-team collaboration. The document then examines why teams struggle with PI planning and what could be done differently, such as cultural awareness and clear communications. It outlines elements of preparation including logistics, organizational, and content readiness. Finally, it discusses setting SMART objectives, planning communication for business alignment, and takes questions.