The results obtained thanks to the flipped classroom with ‘just I¡in time’ teaching method are reviewed. This method allowed to know what the students did not understand after trying to study the instructive materials assigned to them. To achieve that the students work before class methods of marketing and gamification were developed. Methods for the analysis of student responses were also developed. The JiTT method allowes the teacher know in advance those aspects that are most interesting or most dificult to understand for the students as well as their most urgent doubts. Finally, we have developed methods to use the urgent doubts of the students to generate formative feedback and activities to do in the classroom. In the method named “flipped learning forte” the teacher answer the urgent doubts of his students. In the method named ‘flip in colours’ the teacher classify the doubts by their posible utility in the classroom using a color code. With the combined application of these methods in university courses the failure rate of the students has decreased and the mean grade in the exams for the assessment of learning has increased in more than one standard deviation. The rate of students that attain the level of mastery has increased, as well as the student evaluations about the teachers of these courses. Finally, the reasons underlying the efficacy of the proposed flipped method are discussed.