Available from Statgraphics
STATGRAPHICS Sigma Express is an "add-in" for Microsoft Excel that enables users to perform various calculations required when learning or applying Six Sigma. It adds a menu selection to Excel containing sections for each item of the DMAIC paradigm (Define, Measure, Analyze, Improve and Control) plus additional menu items for Tools and Help. The contents are sufficient to cover the needs of yellow belts, green belts and most black belts. In addition, it is similar enough to STATGRAPHICS Centurion that users can easily upgrade to that product if they need additional statistical capabilities.