A modeling method for predictive modeling of a product, which may be but one example of a family of such modeling methods, includes receiving one of a processing condition of a process used to make a fibrous material into the product or a measurement of a property of the fibrous material or the tampon product, and calculating a virtual outcome from the one of the processing condition or the measurement received. The virtual outcome is one or more of not physically measured or not physically measurable, and has a relationship to the processing condition and a relationship to the measurement. The method also includes providing a measurement if the processing condition is received or a processing condition if the measurement is received, according to the virtual outcome calculated. A computing device may be programmed to carry out the method.