This document outlines four models of flipped learning: standard flipped, one day a week flipped with selected content, flipping without recording video lectures, and full hybrid flipping. The standard flipped model involves students viewing recorded lectures as homework and spending class time doing activities and working problems with instructors. The one day a week model flips one lecture per week, like "Flipped Fridays", and selectively chooses what to record. Flipping without recordings uses alternative methods like texts and videos by others to convey lecture content. Full hybrid flipping removes some lectures entirely, replacing them with online activities for students to complete during class time.