Reinforced masonry wall specimens were experimentally tested under the context of TAISHIN project in El Salvador in 2005. The specimens were built using concrete block units, which is one of the most common masonry types used for dwelling in the country. A total of 4 specimens will be analyzed in this study with two main variables: ratio of horizontal reinforcement and lateral load pattern. In case of the former case, a horizontal bar spacing of 400 mm and 600 mm is given according to the provisions given in both codes: the actual code of 1997 and the new code draft of 2004, respectively. In case of the latter, monotonic and cyclic load pattern is given. Failure of all specimens resulted to be due to flexural behavior in the wall. A prediction of the observed experimental behavior of wall specimens is intended to be simulated using two different methods: a simple model analysis proposed by Miha Tomaževič and a discrete cracking model in finite element method. The suitability of the prediction of both methods is checked by the comparison of several characteristics of the behavior of masonry walls under lateral loads observed in the experimental program. Both methods show good prediction for flexural behavior. However, fitting of some parameters in both methods should be carried out to represent other possible failure modes expected in masonry walls.