This article solely purpose is to extract the most commonly used key performance indicators from the literature which deal with theoretical or practical case studies of lean implementation in organizations. The methodological approach towards selection initiated with research of the world paper databases. It continued with unification of the indicators with the same meaning. Furthermore, these indicators would be put through specific statistic filter methods in order to define the most commonly used ones. These are: Work in progress (14), Inventory (12) Lead time (12), Cycle time (12) and Value added time (7). The values in brackets are taken from the analyzed literature and they represent the total frequency of appearance of each KPI respectively.