The document discusses best practices for designing dimensions and models in BPC (Business Planning and Consolidation) software. It warns of potential issues with nested rows/columns, heavy reliance on properties, and users copying data to personal spreadsheets. The document recommends going beyond existing data structures and hierarchies to better match business needs, embracing alternate hierarchies, combining or concatenating dimensions, and prioritizing performance and user acceptance over administrative maintenance. The goal is to make reporting and analysis easier rather than harder in BPC.