摘要：The article summarizes the arguments on minimizing the uncertainty level caused by numerous unforeseen circumstances due to using operational flexibility to increase companies' efficiency (example of small and medium enterprises in the pharmaceutical sector of Iran). The research aims at investigating the relationship between operational flexibility and a company's performance to examine the impact of environmental uncertainty on these relationships. This study was conducted as quantitative. The deductive method using the synergy of systematization of scientific background on the problem and the empirical proof of the formulated hypotheses became a methodological study tool. The article provides evidence of the economic-mathematical model based on data from small and medium-sized pharmaceutical Iranian companies. The study hypotheses are as follows: 1) operational flexibility has a positive effect on the productivity of the pharmaceutical sector of Iran, represented by small and medium-sized companies; 2) uncertainty determines the relationship between the operational flexibility and efficiency of small and medium-sized pharmaceutical companies in Iran. The model constructed by the authors allowed measuring the relationship between variables using regression analysis and moderation analysis (Hayes model). The total number of companies included in the sample is 113. In turn, 228 managers of these pharmaceutical companies took part in the surveys (Iran example). The empirical analysis results showed that the mix flexibility indicator has practically no effect on companies' efficiency, and the volume flexibility and product development flexibility indicators generally have a positive effect on the performance of companies in the pharmaceutical sector. On the other hand, the environmental uncertainty indicator does not help reduce the relationship between the operational flexibility indicator and companies' performance in the pharmaceutical sector of Iran's economy. The study results could be useful for planning small and medium enterprises' activities in the context of improving their performance.
关键词：flexibility; small and medium-sized company; uncertainty; performance; statistical analysis.
