information and communication technologies, knowledge management, and technology and innovation management. Citation analyses studies by IBM and University of Minnesota list him among the world's most-cited authors on knowledge management and the world's seminal contributors in knowledge management. His research is published in two research monographs and more than 50 journal articles, book and encyclopedia chapters, conference proceedings, and reprints. He has served or serves on the editorial, advisory, and review boards of several leading research journals and received R&D grants from the United Nations, Intel Corporation, and SAP University Alliance, among others. His consulting engagements on corporate strategy, national policy, and world development include some of the world's largest governments and corporations and the United Nations. His research, analyses, interviews, and technology ventures have been featured in Business Week, Fortune, Wall Street Journal, Forbes, Fast Company, Business 2.0, Chief Executive, CIO Magazine, CIO Insight, Computerworld, InformationWeek, and He taught undergraduate information systems courses during the fall 1999 Semester at Sea Voyage, served as the ICIS Treasurer from 1994 to 1998, was a member of the AIS Council representing the Americas in 1996 and 1997, chaired the first Americas Conference for AIS (AMCIS), was program cochair for both ICIS (2005) and AMCIS (2003), and is Editor-in-Chief of ISWorld.
YOGESH MALHOTRA AND DENNIS GALLETTAABSTRACT: In recent years, several organizations have implemented nonmandatory information and communication systems that escape the conventional behavioral logic of understanding acceptance and usage from a normative perspective of compliance with the beliefs of others. Because voluntary systems require users' volitional behavior, researchers have traced recent implementation failures to a lack of user commitment. However, gaps in our understanding of volitional usage behavior and user commitment have made it difficult to advance theory, research, and practice on this issue. To validate a proposed research model, cross-sectional, between-subjects, and within-subjects field data were collected from 714 users at the time of initial adoption and after six months of extended use. The model explained between 44.1 percent and 58.5 percent of the variance in adoption and usage behavior based upon direct effects of user commitment. Findings suggest that user commitment plays a critical role in the volitional acceptance and usage of such systems. Affective commitment-that is, internalization and identification based upon personal norms-exhibits a sustained positive influence on usage behavior. In contrast, continuance commitment-that is, compliance based upon social norms-shows a sustained negative influence from initial adoption to extended use. Theory development based upon Kelman's social influence framework offers new empirical insights about system users' commitment and how it affects volitional usage behavior.KEY WORDS AND PHRASES: af...