1 / 22

A Unified Model of IT Use Choices: Contributions from TAM, TTF, and CSE

A Unified Model of IT Use Choices: Contributions from TAM, TTF, and CSE. Diane M. Strong* Worcester Polytechnic Institute Invited Presentation First Annual Workshop on HCI Research in MIS Barcelona, Spain 2002 * This is joint work with Mark T. Dishaw, University of Wisconsin Oshkosh.

zeke
Télécharger la présentation

A Unified Model of IT Use Choices: Contributions from TAM, TTF, and CSE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Unified Model of IT Use Choices: Contributions from TAM, TTF, and CSE Diane M. Strong* Worcester Polytechnic Institute Invited Presentation First Annual Workshop on HCI Research in MIS Barcelona, Spain 2002 *This is joint work with Mark T. Dishaw, University of Wisconsin Oshkosh Diane M. Strong, WPI

  2. General Research Objective • Understand the software utilization choices of end users, by using and extending existing models • Task-technology Fit (TTF) models • Technology Acceptance Model (TAM) • Individual Abilities Constructs, e.g., Experience, Computer Self-efficacy • Conduct a series of studies testing the models and combinations of them Diane M. Strong, WPI

  3. Task-Technology Fit Models Diane M. Strong, WPI

  4. 1. TTF Model Study Operationalize the TTF model in the software maintenance context • Task Model - Vessey's debugging model (planning, knowledge building, diagnosis, modification activities) plus coordination • Technology Model - Henderson & Cooprider Functional Case Technology Model (Production and Coordination functionality) Diane M. Strong, WPI

  5. Dimensions of Fit • Fit along two dimensions • Production Fit: how well the tool’s production functions support software maintenance activities • Coordination Fit: how well the tool’s coordination functions support maintenance coordination activities • Compute Fit using an interaction approach (Venkatramen, 1989) (Dishaw & Strong, 1998) Diane M. Strong, WPI

  6. 2. Add Experience to TTF Operationalize Individual Abilities as: • experience with the task • experience with the technology Tool experience and its interaction with tool characteristics is significant Task experience not significant Adjusted R2 of 0.63 (Dishaw & Strong, Forthcoming) Diane M. Strong, WPI

  7. 3. Combined TAM and TTF • TAM: beliefs about the technology, i.e., perceived usefulness and perceived ease of use • TTF: matching of the technology to the needs of the task to deliver benefits • TAM + TTF: addresses both technology beliefs and rationally computed fit to task • Tool experience as an individual ability • Path model, rather than regression • Fit as latent variable, rather than computed as interaction Diane M. Strong, WPI

  8. TTF-TAM Combined Model Diane M. Strong, WPI

  9. Combined TAM / TTF Results Better results than either TAM or TTF alone Utilization variance explained: • 36% with TAM • 41% with TTF • 51% with TAM/TTF (Dishaw and Strong, 1999) Diane M. Strong, WPI

  10. 4. Add Computer Self-efficacy(Work-in-progress) • CSE may be a better predictor of individual ability for new tools than is tool experience • Generalize TTF assessment beyond software maintenance tasks and tools • Develop an instrument for assessing problem-solving tasks, and the support of such tasks with software • Test previous TTF and TAM/TTF models with a new dataset Diane M. Strong, WPI

  11. Computer Self-Efficacy • Derived from the Social Cognition literature, and is based on Bandura’s work on self-efficacy • A specialized definition of Self-efficacy, i.e., a person’s belief in their ability to accomplish a specific task • A judgment of one’s ability to use a computer Diane M. Strong, WPI

  12. Adding CSE to TTF/TAM Diane M. Strong, WPI

  13. Model Operationalization • Software maintenance TTF is generalized by changing the questionnaire items since • Task model is well grounded in the problem solving and cognitive science literature • Technology model is grounded in the literature on information technology support functionality • Add Compeau & Higgins (1995) 10-item, single factor measure of CSE Diane M. Strong, WPI

  14. Item and Scale Testing • Item Testing using a panel of faculty, advanced students, and professionals • Pilot Study using a small number students and professionals in the university Diane M. Strong, WPI

  15. Data Collection • Use revised instrument • Subjects are students in several classes after the completion of an ordinary assignment • Currently, have 136 data points from: • Operations Management simulation class doing modeling • Programming class doing 3 GL program maintenance • Programming class doing OO program maintenance • Business analysis class doing statistical modeling Diane M. Strong, WPI

  16. Data Analysis Using Amos 4.0, test the models • TTF • TTF plus CSE • Combined TAM/TTF • Combined TAM/TTF plus CSE Have results for Models 1 and 2 Diane M. Strong, WPI

  17. General TTF Model • Chi Sq. 26.77, d.f. 17, p=0.061 • AGFI = 0.89, GFI = 0.95 Diane M. Strong, WPI

  18. General TTF Model with CSE • Chi Sq. 27.24, d.f. 22, p=0.202 • AGFI = 0.91, GFI = 0.96 Diane M. Strong, WPI

  19. Lessons for a Unified Model:Importance of Task • Traditional HCI focuses on Usability, with little or no Task emphasis • TAM adds Usefulness, which implicitly includes Task • TTF has explicit Task focus, which adds to the explanatory power Diane M. Strong, WPI

  20. Lessons for a Unified Model:The Fit Construct • Beyond production and coordination Fit to additional dimensions of Fit • Beyond a point estimate of Fit to a process of Fitting over time (as in implementation) • Beyond individual level models (TTF, TAM) to organizational level models, e.g., for Enterprise systems Diane M. Strong, WPI

  21. Lessons for a Unified Model:Experience and CSE • Measure Experience and Self-efficacy for both Task and Technology • Self-efficacy theory: As Experience increases, Experience dominates abilities as measured by Self-efficacy • Need to better understand relationship between Experience and Self-efficacy Diane M. Strong, WPI

  22. References to the Studies Study 1: Dishaw, M. T. and D. M. Strong, "Supporting Software Maintenance with Software Engineering Tools: A Computed Task-Technology Fit Analysis", Journal of Systems and Software, Vol. 44, No. 2, December 1998, pp. 107-120. Study 2: Dishaw, M. T. and D. M. Strong, "The Effect of Task and Tool Experience on Maintenance CASE Tool Usage", Information Resources Management Journal, Forthcoming. Study 3: Dishaw, M. T. and D. M. Strong, "Extending the Technology Acceptance Model with Task-Technology Fit Constructs", Information & Management, Vol. 36, No. 1, July 1999, pp. 9-21. Study 4 (in-progress): Dishaw, M. T., D. M. Strong, and D. B. Bandy, “Extending the Task-Technology Fit Model with Self-Efficacy Constructs”, Proceedings of the Americas Conference on Information Systems, August 9-11, 2002, Dallas, TX, pp. 1021-1027. Diane M. Strong, WPI

More Related