Quantitative Phase Analysis
Non-trivial and in many cases, custom solutions may be required. (accurate Quantitative analysis is a complete world in itself)
Rietveld programs are commonly used for Quantitative Analysis (refer list in a previous slide).
Refer to non-Rietveld references cited in:
Following using Koalariet / XFIT
http://www.ccp14.ac.uk/tutorial/xfit-95/
http://www.ccp14.ac.uk/poster-talks/david-hay-quant-notes-axaa99/