All Policy Analysis by Aaron Y. Zelin

Drone campaigns have greatly culled the group’s leadership, but leaders are replaceable, and the guided-attack model seen in Pensacola could be a significant force multiplier for any locally rooted affiliates who seek to strike abroad in the coming years.

Three experts on European jihadism discuss the root causes and operational significance of recent Islamist violence in France.

Recent developments in Syria indicate that the jihadi movement is splitting once again, as a prominent ideologue begins to form a third pole at odds with both al-Qaeda and the Islamic State.

Two experts assess the recent attack patterns and future prospects of a group that once seemed on the cusp of defeat in both countries.

Disease prevention efforts in Idlib illustrate the movement's political evolution and its differences from the Islamic State, but the pandemic may still hit the area hard given inconsistent implementation and years of regime destruction.

The rebel administration in Idlib and the Kurdish-led government in the northeast have been more proactive and transparent than the Assad regime, but their populations still need urgent, direct international aid—without the UN’s imprimatur if necessary.

Although attack statistics have declined, the continued lack of stable governance in Diyala and Deir al-Zour shows that Washington and its partners have not absorbed the lessons provided by previous insurgencies.

By the time IS came to the fore in Iraq and Syria, many of its themes and activities were already second nature to Tunisian jihadis who had heard similar messaging at home.

A deeper look into how one of the organization's Tunisian factions in Syria adopted and practiced an even more radical distortion of Islamic thought than its parent group.

How did a democratic bright spot in the Arab Spring become a leading source of Islamic State fighters? Read or watch an in-depth conversation with two jihadism experts.

How did Tunisia, a democratic bright spot of the Arab uprisings with very little history of terrorist violence within its borders before 2011, become one of the largest sources of foreign fighters for the Islamic State? This groundbreaking book presents the first history of the Tunisian jihadi movement and challenges simplified views of jihadism's appeal and success.

Fewer attacks and more prosecutions suggest the country’s integrated approach could eventually become a model for the region.

An in-depth interview on the scope of the terrorist group's remaining activities in Syria, Iraq, and other countries, including the potential for future insurgencies and mass-casualty attacks.

Given the group’s operational silence and loss of foreign help, it may not be able to launch the type of insurgency seen in Syria, but that could change if U.S. attention wanes militarily or diplomatically.

Three leading scholars assess the group’s status and ambitions following the death of its leader, and discuss how to handle the numerous potential supporters still residing in Syrian camps.

The Islamic State no longer governs territory, but aspiring jihadists can now point to a caliphate project achieved in their lifetime, a long-held yearning of the international movement.