Achats et logistique d'approvisionnement : intégration, centralisation ou coordination


Revue Française de Logistique

janvier 1992, n°58

Départements : Information Systems and Operations Management

La fonction logistique


Logistiques Magazine

février 1992, n°65, pp.29-31

Départements : Information Systems and Operations Management

Perceived Usefulness, Ease of Use and User Acceptance of Information Technology: A replication


MIS Quarterly

juin 1992, vol. 16, n°2, pp.227-247

Départements : Information Systems and Operations Management, GREGHEC (CNRS)

Mots clés : User acceptance, end-user computing, user measurement

This paper presents the findings of two studies that replicate previous work by Fred Davis on the subject of perceived usefulness, ease of use, and usage of information technology. The two studies focus on evaluating the psychometric properties of the ease of use and usefulness scales, while examining the relationship between ease of use,usefulness, and system usage. Study 1 provides a strong assessment of the convergent validity of the two scales by examining heterogeneous user groups dealing with heterogeneous implementations of messaging technology. In addition, because one might expect users to share similar perspectives about voice and electronic mail, the study also represents a strong test of discriminant validity. In this study a total of 118respondents from 10 different organizations were surveyed for their attitudes toward two messaging technologies: voice and electronic mail. Study 2 complements the approach taken inStudy 1 by focusing on the ability to demonstrate discriminant validity. Three popular software applications (WordPerfect, Lotus 1-2-3, and Harvard Graphics) were examined based on the expectation that they would all be rated highly on both scales. In this study a total of 73 users rated the three packages in terms of ease of use and usefulness.The results of the studies demonstrate reliable and valid scales for measurement of perceived ease of use and usefulness. In addition, the paper tests the relationships between ease of use, usefulness, and usage using structural equation modelling. The results of this model are consistent with previous research for Study 1, suggestingthat usefulness is an important determinant of system use. For Study 2 the results are somewhat mixed, but indicate the importance of both ease of use and usefulness. Differences in conditions of usage are explored to explain these findings

The Use of Information in Decision Making: An Experimental Investigation of the Impact of Computer Based Decision Aids


MIS Quarterly

septembre 1992, vol. 16, n°3, pp.373-393

Départements : Information Systems and Operations Management, GREGHEC (CNRS)

Mots clés : Decision support systems, information processing, cognitive cost benefit theory

The traditional assumption in the decision support systems (DSS) literature is that if decision makers are provided with expanded processing capabilities they will use them to analyze problems in more depth and, as a result, make better decisions. Empirical studies investigating the relationship between DSS and decision quality have not borne this out. The explanation for such outcomes could be found in behavioral decision making theories. The literature on behavioral decision making indicates that the conservation of effort may be more important than increased decision quality in some cases. If this is so, then the use of a decision aid may result in effort savings but not improved decision performance. The two experiments reported here use verbal protocolanalysis to compare the extent of information use by unaided decision makers and usersof a decision aid designed to support preferential choice problems. The results of the twostudies indicate that subjects with a decision aid did not use more information than those without one. Overall, subjects behaved as if effort minimization was an important consideration. For DSS researchers these studies indicate that to understand the DSS-decision quality relationship, it is necessary to consider the decision maker's tradeoff between improving decision quality and conserving effort. For DSS designers theseresults imply a need to focus on the moderating role that effort will play in determining DSS effectiveness

Towards a DEISS ?


European Journal of Operational Research

1992, n°61, pp.72-85

Départements : Information Systems and Operations Management