The purpose of this paper is to compare quality management certified and non-certified production companies regarding the production cost efficiency. A research carried out in 200 Palestinian production companies by means of questionnaires. The questionnaire was sent by email, and it was requested to be answered by production managers, the study use the independent t-test to test correlation between quality management and production cost efficiency. The certified companies significantly outperformed the non-certified companies with regards to waste elimination, production efficiency and better product quality. The subjective of data collection through production managers could involve risk of receiving biased response regarding the performance measure. Additionally, the research design by itself limited the results and findings on Palestinian context with no ability to generalize to other context.