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Technology assessment are intended to support decisions about future actions. These decisions are characterized by uncertainty conditions. This paper introduces a model to clarify the variable uncertainty conditions. In relation to technology assessment activities the use of the concepts efficacy and effectiveness have often been confused. The two concepts are here presented and discussed in relation to the systems theory framework: structure – processes – outcome. One method to reduce uncertainty situations from an economic viewpoint is to peiform a cost benefit/effectiveness analysis. Performing a cost benefit/effectiveness analysis can be protocolled in ten steps, and these steps are outlined. The true value of a cost benefit/effectiveness analysis lies more in the process of analysis than in the final result. There is no guarantee that benefits will be achieved and reports are often seen to be very technical. More emphasis should be put in reporting the results of cost benefit/effectiveness analysis.
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