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On September 11, 2001, United States witnessed one the most tragic terrorist attacks in history, well-known as 9/11 attack. Four coordinated suicide terrorist attacks on high profile U.S. landmarks were executed by Islamic terrorist group Al-Qaeda. Social Network Analysis (SNA) has been accepted worldwide to be the most promising method for investigating such type of terrorist attacks. In prior research, various centrality measures of SNA have been discussed for identifying key players and attaining terrorist target lists/ranking. Most of the times, these measures result in different rank ordering patterns and different set of key players. As a solution to this problem, Analytical Hierarchy Process (AHP) can be plugged in with SNA centrality measures for obtaining improved results with the essence of subjective or objective choices of the decision maker. In this paper, 9/11 terrorist network is analyzed using AHP with SNA centrality measures as decision criteria, to discover the overall rank ordering of 19 hijackers and their affiliates, involved in the attack. Further, sensitivity analysis is discussed to deal with changes in subjective judgements. The experimental results demonstrate that the combination of AHP with SNA centrality measures results in propitious rank ordering in considered terrorist network.

RANKING TERRORIST NODES OF 9/11 NETWORK USING ANALYTICAL HIERARCHY PROCESS WITH SOCIAL NETWORK ANALYSIS