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This paper presents a comprehensive and detailed assessment of the National Fenestration Rating Council (NFRC) 500 Procedure. This procedure emphasizes simulation calculations and allows the utilization of computer software in analyzing and calculating the Condensation Resistance Rating for comparative purposes. For those products that cannot be simulated, a test only option is also offered in the standard. This paper analyzes the results obtained through NFRC annual round robin tests run from 1997 to 2001. Each round robin specimen was modeled per NFRC 100 (1997): Procedures for Determining Fenestration Product U-factors and NFRC Test Procedure for Measuring the Steady-State Thermal Transmittance of Fenestration Systems using NFRC-approved computer software tools WINDOW 4.1 and THERM 2.1. The simulated results were used as a benchmark for the analysis of the testing data. All of the NFRC round robin test specimens were tested at NFRC-accredited testing laboratories.