I use this tool and demonstrated its output at WOCT. This tool is used extensively within Microsoft.
The Pairwise Independent Combinatorial Testing (PICT) tool installer includes a user’s guide that describes all the features and contains sample models. This command-line tool makes no registry changes on your system.
I would makes sure you especially consider the PICT feature where:
· You can identify invalid inputs that should cause test failures, and PICT makes sure that each test case contains only one invalid value to prevent input masking-in problems.
Avoiding fault masking will avoid many problems you might otherwise see. Don’t blindly combine multiple invalid inputs as they do in http://www.ise.gmu.edu/~ofut/rsrch/abstracts/evalcombstrat.html