The use of reinforced concrete block masonry walls became moreattractive for designers in the past decade for many reasons. Such walls are eithersubjected to uniformly distributed or concentrated loads.In this study a numerical program was performed to investigate thebehaviour of the masonry walls by both the 2-D and 3-D finite element method.However, the 2-D finite element method was not capable of examining the effectof all design parameters and in order to achieve a better and accuraterepresentation for the walls,3-D finite element method was applied. The effectsof the type of loading, holes grouting, area of reinforcing steel, sides boundaryconditions and the load eccentricity on the developed deformations and stresseswas examined.The behaviour of reinforced masonry walls resting on either a rigid or anelastic foundation was studied. The effect of having an edge or a middle local gapof soil underneath the wall was also investigated. Two types of modeling wereexamined: while the wall panel was represented by quadratic elements in the 2-Danalysis and eight nodes hexahedral elements in the 3-D analysis, the type of soilwas represented either by Winkler model or by quadratic elements (semi-infinitehalf space). Fifty seven models were examined to study the effect of type of soiland loss of support on masonry wall having different sides boundary conditionsrepresenting intersecting connecting walls as exist in practice. Different sizes ofsolution based on the The stiffness method is presented andverified for using in analyzing such an irregular system. Theprocedure depends on the implementation of a geometrictransformation matrix specifically formulated for the case ofnon collinear coupled shear walls. It includes coordinatetransformations, wall width, and stiffness coefficients. Thecontinuous method is also formulated to obtain the forces anddisplacements of walls taking into account the inclinationangles of beam and wall piers.To verify the results of the proposed methods, the finiteelement method is used. A suitable mesh is prepared and athree dimensional element type is used. The proposedprocedures verify to be accurate and efficient in analyzingsuch cases. To use standard structural analysis computerprograms in solving such case, the frame analogy methodconsidering the wall width as rigid arm is also evaluated.A parametric study is performed to illustrate the effectof inclination of wall piers and connecting beam on forces anddisplacements of the wall system. The parametric studyincludes the effect of inclination of wall piers andconnecting beam on lateral deflection and slope angle toinvestigate the wall stiffness. Shear in connecting beam andmoments in wall piers are also studied. A study of theconnecting beam torque which can take place only in the caseof non collinear coupled shear walls is also included .. Basedon the obtained results, design considerations are discussedto help the designer engineer to make good estimation offorces and displacements of such walls through simple analysisprocedures.