The Quadratic Assignment Problem (QAP) has remained one of the great challenges in combinatorial optimization. It is still considered a computationally nontrivial task to solve modest size problems, say of size n=25. The QAPLIB was first published in 1991, in order to provide a unified testbed for QAP, accessible to the scientific community. It consisted of virtually all QAP instances that were accessible to the authors at that time.* README PDF documentation * The solutions tarball contains 128 SLN files. * Data tarball contains 136 .dat files corresponding to 136 instances.