By W. Gall BSc (auth.), Peter Comer (eds.)
On behalf of the setting up Committee of the eleventh ARTS i want to welcome all of the delegates, consultation chairpersons and authors. I quite welcome new delegates, delegates from mainland Europe and from different nations. on the time of the final symposium, our 10th anniversary, we seemed again at the development of the symposium and the aid it had acquired from such a lot of humans. now not least was once the help given through Mrs Ruth Campbell who, among this symposium and the final, has retired from the nationwide Centre of structures Reliability. The establishing Committee might hereby prefer to recognize a truly distinctive debt of gratitude, over a long time, to Ruth. Our gratitude additionally is going to Dr A. Z. Keller of the collage of Bradford, the establishing Committee Chairman on the tenth Symposium, our President for eleventh ARTS and, because the starting, a staunch supporter of the humanities. Our thank you visit Mme A. Camino of Electricite de France for being our after-dinner speaker and to Mr A. J. Bourne for being our keynote speaker. Their speeches were keenly expected. at the back of the symposium, the precise and tough paintings of the executive employees of the nationwide Centre of structures Reliability maintains even after it has ended. Our thank you visit them, fairly, and to the schools of Liverpool, Manchester Institute of technology and expertise and Bradford for his or her constant aid to the symposium.
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If performance times are available for each type of operation represented, it is possible to use GOMS to predict overall task performance times. For example, the technique might be used to estimate the times required to access items of information via system displays [16]. The bottleneck in this form of time estimation is obtaining accurate time estimates for the various fundamental 'operations'. The most useful aspect of GOMS is its representational format which is isomorphic with the hierarchical diagram format in HTA, but is much more concise for 20 representational purposes.
5 since if random answers were provided the graph would be a straight line, gradient 1. 5) would be obtained and is interpreted as: 'There is no evidence in support of the proposition but there is some against it'. If the test answers agree with the 36 reference answers then the support pair (1 1) is obtained from the graph and the clause is true. Combining Results: If several curves are generated by an operator, their corresponding clauses may be combined into a more general overall statement using FRIL support logic following the construction of a suitable FRIL 'predicate' (rule).
The most useful application of the technique would be in assessing alternative control room interfaces to obtain a comparative assessment of their demands in terms of learning time and performance efficiency. It should be noted, however, that this technique is still under development and it is not clear whether the software involved in the analysis is openly available. Comparison between HTA and the other techniques Comparing the facil ities offered by HTA with the cognitive task analysis techni ques descri bed above highl ights a number of important pract i ca 1 and theoretical differences.