Pirouette is a comprehensive chemometrics package designed specifically for the Windows operating systems. Prediction, classification, data exploration and pattern recognition methods are implemented in a single program. A simple to use yet very powerful interface facilitates interacting with raw and processed data. Support for many common instrument and data exchange file formats make importing data painless. Thousands of subsets can be created from a single data file, allowing the user to exercise many different what-if scenarios without having to collect additional data. All calculated products are saved in a single file and can be retrieved and manipulated via the Object Manager, a unique data handling system. Transfer of calibration options allow spectra to be adjusted appropriately for prediction with a model from another source. See. See specifications for more details.