SIGMA Assessment Systems
P.O. Box 610757
Port Huron, MI
USA 48061-0757
Email: sigma@sigmaassessmentsystems.com
Phone: 1.800.265.1285
Fax: 1.800.361.9411
In Canada:
P.O. Box 3292, Station B
London, ON
Canada N6A 4K3
Phone: 1.800.401.4480
1.519.673.0833