HELP introduces to the Quanto Help on line. All the graphic options and operations are described; mixtures data of samples 1a and 2 from Round Robin on Quantitative Phase Analysis sponsered by IUCr, Commission for Powder Diffraction (http://www.iucr.org/iucr-top/comm/cpd/index-html) will be used as examples.

GENERAL INFO contains a general description of the program and its features, the theoretical background of QPA by the Rietveld Method, the mathematical expressions of all functions implemented in Quanto.