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The traditional methods for analysing rectangular piles (Barrettes) are mainly modelling the barrette and surrounding soil using 3D-FE. 3D-FE for barrette foundations needs a huge computational effort. Consequently, a huge system of equations required to be solved. In this paper, a composed coefficient technique (CCT) is developed for analysing laterally loaded barrettes. The technique takes into account the three-dimensional full interactions between the barrette and the surrounding soil. In the technique, the three dimensional coefficients of the stiffness matrix of the barrette are decomposed to be one-dimensional. This enables easily adding these coefficients to those of stiffness matrix of the soil. Besides the practical application and efficiency of the technique, the nonlinear response of the barrette using any load-settlement relation can be considered. The technique may be al so applied for single barrette, barrette groups or barrette raft. A series of validations is carried out to verify the application of CCT for analysing single barrettes. It is found that treating the barrette by CCT, gives nearly the same results compared with the measured values from load tests and FE results. The proposed technique is implemented in the program ELPLA El Gendy M and El Gendy A (Analysis and design of raft and piled Raft-Program ELPLA, GEOTEC Software Inc., Calgary, 2019). [ABSTRACT FROM AUTHOR]