The following resources will help you further your knowledge and understanding of comprehensible output.
This article provides more details on comparing Comprehensible Input vs. output.
The following resource will help gain more information about Gradual Release of Responsibility (GRR) which is referred to in the STARTALK video presentation of Thomas Sauer and Greta Lundgaard viewed in this module.
The presentation linked below is given by Merrill Swain who is the proponent of the Comprehensible Output Hypothesis. It is a long slide presentation in which she discusses the History and Future of Output Hypothesis. You may find it helpful if you like to pursue further research in that area.
A Slide Presentation on Comprehensible Output
Comprehensible Input & Task-Based Output Activities to Achieve Communication