Journal of Advances in Mathematics and Computer Science 27(2): 1-15, 2018; Article no.JAMCS.40808 ISSN: 2456-9968 (Past name: British Journal of Mathematics & Computer Science, Past ISSN: 2231-0851) _____________________________________ *Corresponding author: E-mail: abdallah_lovers12@yahoo.com; Bi-Level Multi-Objective Large Scale Integer Quadratic Programming Problem with Symmetric Trapezoidal Fuzzy Numbers in the Objective Functions O. E. Emam 1 , E. Fathy 2 and A. A. Abdullah 3* 1 Department of Information Systems, Faculty of Computer Science and Information, Helwan University, P.O.Box 11795, Egypt. 2 Department of Mathematics, Faculty of Science, Helwan University, P.O.Box 11795, Egypt. 3 Department of Information Systems, Higher Institute of Computer Science and Information Systems, Fifth Avenue - New Cairo, Egypt. Authors’ contributions This work was carried out in collaboration between all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/JAMCS/2018/40808 Editor(s): (1) Junjie Chen, Professor, Department of Electrical Engineering, University of Texas at Arlington, USA. Reviewers: (1) Piyush Shroff, Texas State University, USA. (2) Tunjo Perić, University of Zagreb, Croatia. Complete Peer review History: http://www.sciencedomain.org/review-history/24259 Received: 31 st January 2018 Accepted: 13 th April 2018 Published: 21 st April 2018 _______________________________________________________________________________ Abstract This paper focuses on the solution of a Bi-Level Multi-Objective Large Scale Integer Quadratic Programming (BLMOLSIQP) problem, where all the decision parameters in the objective functions are symmetric trapezoidal fuzzy numbers, and have block angular structure of the constraints. The suggested algorithm based on α-level sets of fuzzy numbers, weighted sum method, Taylor’s series, Decomposition algorithm, and also the Branch and Bound method is used to find a compromised solution for the problem under consideration. Then, the proposed algorithm is compared to Frank and Wolfe algorithm to demonstrate its effectiveness. Moreover, the theoretical results are illustrated with the help of a numerical example. Keywords: Large scale; integer programming; quadratic programming; multi-objective; fuzzy programming; bi-level programming. Original Research Article