This document analyzes the performance of 802.11 wireless LANs. It summarizes methods for calculating throughput and delay. Throughput is determined by the conditional collision probability, which depends on the number of contending nodes. Delay is modeled using a generalized state transition diagram and Mason's formula to determine MAC layer service time as a function of the number of saturated nodes. The analysis considers both non-saturated and saturated network conditions to understand optimal and maximum throughput.