Choosing the right method for teaching is an important step in learning. Corporate trainers have always been interested in finding new ways to achieve effective learning. The present study seeks to improve language learning by measuring, comparing and prioritizing the effectiveness of three methods: traditional, blended and flipped method. In terms of purpose and nature, the present study was experimental and with respect to method it was quasi-experimental including a pre-test and a post-test designed with an equivalent control group. The participants consisted of 66 employees in an Iranian organization who were required to attend English language courses. The participants were sampled in accordance with training needs analysis results in the organization. Moreover, data were analyzed by means of descriptive and inferential statistics including mean analysis, standard deviation, F-way ANOVA, and Scheffe post hoc test using SPSS software version 25. The findings of the study indicate a significant difference between the three groups and the ranking of methods in terms of learning effectiveness from the highest to the lowest level includes; 1)Flipped 2) Blended 3) Traditional, respectively. The results showed that in spite of the high effectiveness of the flipped classroom to the other methods, some cultural differences such as family preference, feasts, training customs and also resistance to new methods of learning hindered the allocation of sufficient time for practicing the lesson at home. In addition, such hindrances partially trace back to ancient Iranian culture. In conclusion, some suggestions were proposed to modify technology acceptance and other related weaknesses.
