Video Displays, Work, and Vision (1983) / Chapter Skim
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2. Critique of Survey Methodology
2. Critique of Survey Methodology
Pages 30-43
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From page 30... ...
There are literally hundreds of mental and physical disease categories that would need to be examined specifically by careful scientific analysis. And there would be an almost endless number of properties of VDTs (or other devices)
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From page 31... ...
Using well-designed experiments, one can control competing explanatory variables by randomly assigning people to conditions that vary only on the variable hypothesized to be causal: for example, one could randomly assign people to either data entry or data acquisition work and, within those conditions, to a group either using or not using VDTs. Most carefully controlled experimental research also has-some disadvantages, however.
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From page 32... ...
Table 2.1 summarizes six studies comparing VDT work to non-VDT work or examining a range of VDT exposure. A critical appraisal of these studies indicates that they are uneven with regard to a number of basic criteria for drawing strong inferences from data (whether experimental or survey)
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From page 33... ...
To consider job content and job setting, one needs an adequate job analysis. To consider individual differences, one needs an adequate assessment of such variables as employee motivation and skills.
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From page 38... ...
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From page 40... ...
While structured interviewing techniques with standardized scales may put words in the respondent's mouth, such an effect should be constant across different conditions of VDT use (unless one is prepared to argue otherwise on the basis of some compelling theory) and should, therefore, not affect the relative differences in intensity or frequency of response as a function of VDT exposure.
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From page 41... ...
4. What physical conditions are associated with complaints of workers using VDTs?
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From page 42... ...
RESEARCH DESIGN CONSIDERATIONS A number of criteria should be applied in designing future field or experimental research on effects of working with VDTs (priorities for research are discussed in Chapter 10~. It is reasonable, for example, to expect investigators to use multivariate analyses to identify the relative contributions of competing predictors (competing explanations)
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From page 43... ...
Practical Considerations We do not mean to suggest that field studies must be of a perfect design to be of value; designing research always involves compromises, and probably no study will ever be done that will meet all of the criteria for an ideal field study. Many practical difficulties have been and will be encountered in planning and conducting field research on complaints involving VDT use.
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