PPT Slide
 
 
Chekcell: Interpreting Crysfire Summary Files: Powder Indexing and Spacegroup Assignment 
- Crysfire interlinks with Chekcell for Windows (part of the LMGP suite for Windows by Jean Laugier and Bernard Bochu).  Chekcell provides a graphical interface for manually and automatically suggesting a best cell/spacegroup combination using both FOM and algorithms relating to parsimony of superfluous HKLs. 
 
http://www.ccp14.ac.uk/tutorial/lmgp/