By Lennard Toma and originally published as a single article in the Corporate Rebels blog
First read Part 1 of this article here, which describes each of 4 decision-making processes and its advantages and disadvantages..
Comparison
When examining these four methods, it becomes clear that they are distinct from one another. S3 and IDM share many features, but Deep Democracy and the Advice Process adopt different perspectives and unique foundational positions. Deep Democracy appears to be particularly effective for complex decisions that require everyone to be involved and approve the outcome, while S3, IDM, and the Advice Process are all focused on efficiency and expediting decision-making.
The Advice Process is the easiest to implement, followed by S3, then IDM (where most of Holacracy is needed to execute it properly), and for Deep Democracy, a trained facilitator is necessary for successful implementation.[…]