The FSSP software has been developed to facilitate the practical use of mathematical models to predict growth of spoilage and pathogenic microorganisms in food. A major objective has been to develop a user-friendly software to predict the effect of constant or fluctuating temperature storage conditions on product shelf-life. FSSP is a significantly expanded version of the Seafood Spoilage and Safety Predictor software which was first released in January 1999. This Windows-based software is available for free from the Danish National Food Institute.