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They also mentioned four pillars for flipped learning
The goal is for students to be active in class so that they can have dynamic learning and learn. 
This methodology allows the teacher to see what students are learning from in class and what is the result that the class gives and will allow him to reorganize if it does not give results.
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students have resources like
Videos
mental maps
audio
slideshow
and learn at their own pace.
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It takes more time to plan.
Not all students learn alone.
Radical change of methodology with students.
Some teachers are not willing to change the methodology.
Flexible learning environment.
Learning culture.
Intentional content.
Professional Educator.
It helps us improve the way we teach and look for new teaching methods.