Purpose: The thesis will try the measure the efficiency of Lebanese banks, to rank and rate them using multiple approaches and taking into considerations the effect of bank size. The main objective is to compare the efficiency score to the actual ranking to see if there is any discrepancy and to see if the performance of large banks is better than that of unlisted banks. Design/ methodology/ approach: only top ten Lebanese banks are included in this thesis due to scarcity of information. Data for the study cover the period from 2008 to 2012. For the analysis and ranking of banks ‘efficiency, ...