Title: "Reductor: A Pattern to Solve Problems with Decrease-And-Conquer Algorithms" Authors: Jose Manuel Burgos-Ortiz (jmburgos@fi.upm.es) Javier Galve-Frances (jgalve@fi.upm.es) contact Julio García-Martín (juliog@fi.upm.es) Miguel Sutil-Martín (msutil@arrakis.es) Address: Dpto. LSIIS - Facultad de Informatica Campus de Montegancedo, s/n - Boadilla del Monte 28660 Madrid (SPAIN) Phone: (34)(91) 3367455 Abstract: "Problems that require a traversal on a collection of data can be solved following a decrease-and-conquer algorithm strategy. Reductor is a behavior pattern that describes an object-oriented design relying on higher-order facilities to solve this sort of problems"