Students are doing something with the content to enhance their understanding.
University of Florida Center of Instructional Technology and Training on Active Learning - http://citt.ufl.edu/online-teaching-resources/activelearning/active-vs-passive-learning-in-online-courses/
Using Active Learning in the Classroom PDF from Florida State University -https://distance.fsu.edu/docs/instruction_at_fsu/Chptr8.pdf
Challenge Based Learning
Digital Promise: Challenge Based Learning - http://cbl.digitalpromise.org/
Digital Promise: Challenge Based Learning Guide - http://cbl.digitalpromise.org/wp-content/uploads/sites/7/2016/10/CBL_Guide2016.pdf
What is Project Based Learning? - http://www.bie.org/about/what_pbl