The International Security Program at the Belfer Center for Science and International Affairs at Harvard published in September 2017 a study titled "The Muslim Brotherhood Movement in the Arab Winter" by Stig Jarle Hansen, Mohamed Husein Gaas, and Ida Bary.
The study maps the three most important Brotherhood-influenced organizations in Egypt, Tunisia, and Sudan. It concludes that the Muslim Brotherhood is diverse and fragmented but its ideology will remain a significant political force.