Development and Measurement Validity of a Task-Technology Fit Instrument for User Evaluations of Information System

Although many researchers have raised concerns about the lack of theoretical underpinnings for the user evaluation construct and the lack of measurement validity for specific instruments measuring it, the construct is still widely used in IS research. This paper reports on the development and measurement validity of a diagnostic tool used in recently published research to evaluate an organization's overall information systems and services. A distinctive feature of this instrument is that it is conceptually based on the task-technology fit theory in which the correspondence between information systems functionality and task requirements leads to positive user evaluations, and positive performance impacts. Specifically, the instrument development was guided by a task model of managerial decision making using recorded organizational information. This model suggested the different information systems functionalities required by users for that task, which then serve as the basis for a “task-technology fit” (TTF) instrument. The instrument thus measures the degree to which an organization's information systems and services meet the information needs of its managers. An extensive test of the measurement validity of the instrument is conducted using a sample of 357 users in 10 companies. It is found to have excellent reliability and discriminant validity for 12 dimensions of TTF, and also exhibits strong predictive validity. Finally, the instrument is compared to two other well-known user evaluation instruments. Though no single instrument can meet all needs, the instrument presented here should be considered an attractive option for researchers and practitioners seeking to measure the effectiveness of organizational information systems.     

环境主义的核心

如果试图问什么是环境主义,可能会有许多不同的回答。本文通过对环境主义的考察,提出正义在概念上和历史上都是环境主义的核心,应当用环境正义的原则处理人与自然的关系。     

Using process evaluation to determine effectiveness of participatory ergonomics training interventions in construction

The construction industry continues to experience high rates of musculoskeletal injuries despite the widespread promotion of ergonomic solutions. Participatory ergonomics (PE) has been suggested as one approach to engage workers and employers for reducing physical exposures from work tasks but a systematic review of participatory ergonomics programs showed inconclusive results.. A process evaluation is used to monitor and document the implementation of a program and can aid in understanding the relationship between the program elements and the program outcomes. The purpose of this project is to describe a proposed process evaluation for use in a participatory ergonomic training program in construction workers and to evaluate its utility in a demonstration project among floor layers.     

Financial Abuse of Older People by a Family Member: A Difficult Terrain for Service Providers in Australia

Financial abuse by a family member is the most common form of abuse experienced by older Australians, and early intervention is required. National online surveys of 228 chief executive officers and 214 aged care service providers found that, while they were well placed to recognize financial abuse, it was often difficult to intervene successfully. Problems providers encountered included difficulties in detecting abuse, the need for consent before they could take action, the risk that the abusive family member would withdraw the client from the service, and a lack of resources to deal with the complexities inherent in situations of financial abuse.     

Publication patterns of faculty in commision on accreditation for marriage and family therapy education programs

Journal articles published by faculty in Commission on Accreditation for Marriage and Family Therapy Education (COAMFTE) programs from 1998 to 2002 were analyzed to determine patterns regarding the amount and type of research conducted by this group. Fifty-eight percent of the articles were identified as research. Slightly more than 10% of these dealt with clinical processes and outcomes. Forty percent of studies reported a specific source of funding. Twenty-nine percent of research articles used qualitative methods, with percentages rising over the course of time. Results suggest the average number of publications per faculty member was relatively low, particularly for senior faculty. Implications for these findings are discussed.     

An application of multi-discipline group working

The paper describes the application of the concept of working in multi-discipline groups in a company manufacturing air-handling fans and customised air-handling equipment on a jobbing type basis. The reasons for organising along these lines is explained together with the method used for formulation of groups. Operating experiences with this form of organisation are described and the results of an attitude survey of operatives and supervisors are discussed.     

Variability in PAH-DNA Adduct Measurements in Peripheral Mononuclear Cells: Implications for Quantitative Cancer Risk Assessment

Biomarkers such as DNA adducts have significant potential to improve quantitative risk assessment by characterizing individual differences in metabolism of genotoxins and DNA repair and accounting for some of the factors that could affect interindividual variation in cancer risk. Inherent uncertainty in laboratory measurements and within-person variability of DNA adduct levels over time are putatively unrelated to cancer risk and should be subtracted from observed variation to better estimate interindividual variability of response to carcinogen exposure. A total of 41 volunteers, both smokers and nonsmokers, were asked to provide a peripheral blood sample every 3 weeks for several months in order to specifically assess intraindividual variability of polycyclic aromatic hydrocarbon (PAH)-DNA adduct levels. The intraindividual variance in PAH-DNA adduct levels, together with measurement uncertainty (laboratory variability and unaccounted for differences in exposure), constituted roughly 30% of the overall variance. An estimated 70% of the total variance was contributed by interindividual variability and is probably representative of the true biologic variability of response to carcinogenic exposure in lymphocytes. The estimated interindividual variability in DNA damage after subtracting intraindividual variability and measurement uncertainty was 24-fold. Inter-individual variance was higher (52-fold) in persons who constitutively lack the Glutathione S-Transferase M1 (GSTM1) gene which is important in the detoxification pathway of PAH. Risk assessment models that do not consider the variability of susceptibility to DNA damage following carcinogen exposure may underestimate risks to the general population, especially for those people who are most vulnerable.