\input zb-basic \input zb-ioport \iteman{io-port 05618303} \itemau{Belli, Fevzi; Eminov, Mubariz; Gokce, Nida} \itemti{Model-based test prioritizing -- a comparative soft-computing approach and case studies.} \itemso{Mertsching, B\"arbel (ed.) et al., KI 2009: Advances in artificial intelligence. 32nd annual German conference on AI, Paderborn, Germany, September 15--18, 2009. Proceedings. Berlin: Springer (ISBN 978-3-642-04616-2). Lecture Notes in Computer Science 5803. Lecture Notes in Artificial Intelligence, 427-434 (2009).} \itemab Summary: Man-machine systems have many features that are to be considered simultaneously. Their validation often leads to a large number of tests; due to time and cost constraints they cannot exhaustively be run. It is then essential to prioritize the test subsets in accordance with their importance for relevant features. This paper applies soft-computing techniques to the prioritizing problem and proposes a graph model-based approach where preference degrees are indirectly deter mined. Events, which imply the relevant system behavior, are classified, and test cases are clustered using (i) unsupervised neural network clustering, and (ii) Fuzzy c-Means clustering algorithm. Two industrial case studies validate the approach and compare the applied techniques. \itemrv{~} \itemcc{} \itemut{model-based test prioritizing; adaptive competitive learning; fuzzy c-means; clustering; neural networks} \itemli{doi:10.1007/978-3-642-04617-9\_54} \end