Journal of Information & Systems Management Ahed Abugabah 4 3 2014 http://www.dline.info/jism/fulltext/v4n3/1.pdf No matter how advanced an information system becomes the users rather than the designers will always be its final “judges”. So users’ attributes/characteristics form an important consideration when investigating and designing information systems. In an attempt to improve the benefits gained by users from such systems, this study aims to investigate whether user characteristics moderate the effect on user performance in complex information system environments. Understanding the relationship between individual differences and user performance helps design effective information systems that meet user requirements, this in turn improves the effectiveness of systems usage.