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Schaffer, Eric (2006): Offshore usability: helping meet the global demand?. In Interactions, 13 (2) pp. 12-13.
Schaffer, Eric (2006): A decision table: offshore or not?: (when not to use offshore resources). In Interactions, 13 (2) pp. 32-33.
Sorflaten, John, Schaffer, Eric (1999): Interactive voice response (IVR) case study: Testing your telephone-based E-Commerce suppo. In The Journal of Electronic Commerce, 12 (1) pp. . http://www.humanfactors.com/downloads/ivr.asp