Modified generalized concatenated codes and their application to the construction and decoding of LUEP codes We propose a modification of generalized concatenated codes, which allows us to construct some of the best known binary codes in a simple way. Furthermore, a large class of optimal linear unequal error protection codes (LUEP codes) can easily be generated. All constructed codes can be efficiently decoded by the Blokh-Zyablov-Zinov’ev algorithm if an appropriate metric is used.