Mathcad has a file in the library and one in the application file. Both refer to the basic types(preceptron,Hopfield etc.). and the operations charateristic of each. Mathcad doesn'f have an avenue for fuzzy logic or VLIS design, and it is necessary to construct the dlls to augment this approach. This would be a very time consuming project worthy of an extension book by itself for either catagory. The basic ideas are there, but building an adaptive neuro fuzzy inference system that could output usable information, well, visit www.fuzzytech.com or get fuzzy and neural approaches in engineering J.Hines.