A mathematical model of the finding of usability problems
INTERCHI '93 Proceedings of the INTERCHI '93 conference on Human factors in computing systems
The scatter of documents over databases in different subject domains: how many databases are needed?
Journal of the American Society for Information Science and Technology
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We present a model that describes which fraction of the literature on a certain topic we will find when we use n (n = 1, 2, …) databases. It is a generalization of the theory of discovering usability problems. We prove that, in all practical cases, this fraction is a concave function of n, the number of used databases, thereby explaining some graphs that exist in the literature. We also study limiting features of this fraction for n very high and we characterize the case that we find all literature on a certain topic for n high enough. © 2013 Wiley Periodicals, Inc.