This document provides formulas and calculations for analyzing performance counters related to a BSS (Base Station Subsystem) network. It includes over 30 sections with formulas for metrics such as additional GPRS channels used, multislot allocations, TBF durations, RLC blocks, call drops, handovers, traffic levels, and more. The document is intended for use by Nokia Networks customers and technicians to evaluate technical performance issues in BSS networks.