The document discusses big room planning (BRP), which is a planning method used for mid-range planning of product delivery across multiple teams. BRP involves co-locating teams for 2 days to establish a shared vision, context, and plan that accounts for adjustments, risks, dependencies, and gains commitment from participants. When used at scale for an entire product delivery organization, BRP leads to better, more reliable plans created faster with happier participants who are more committed to execution.