This central role of experimentation has generated an ongoing interest in the definition of adequate experimental protocols and the use of inferential procedures for comparing two or more algorithms, either on single or multiple problem instances [2, 46, 34, 18, 37, 58, 22, 59, 9, 11, 5, 6, 30, 29, 24, 23, 16, 39, 33, 8].