Enquiring why terrorism occurs is an endeavour to identify the causes and a ‘root cause’rnor at least ‘root causes’ of the phenomenon. More importantly, it is also about identifyingrnthe causation or causal analysis, the way in which the cause-events or cause-state ofrnaffairs are linked with one another and with the effect-event or effect-state of affair, i.e.rnterrorism.rnThis research thesis, “Al Qaeda versus the War on Terror: A Study on Psychological andrnEconomic Causal Factorsâ€, is a qualitative and descriptive analysis of the psychologicalrnand economic causation of terrorism. The research aims at scrutinizing whetherrnpsychological or economic causes can avoid the other from causing terrorism andrnbecome the sole causes of terrorism by themselves, as it is claimed by primarilyrn1 economic or primarily psychological cause-causation. Plus, it aims at scrutinizingrnwhether temporal precedence or causal power matters more in the causation ofrnterrorism and whether economic and psychological factors apply their causal power tornyield terrorism on the geographic space or on the ’mind’ entity.rnThe research disagrees with primary-cause and chain of causes-causation. To assert thatrnpsychological or economic factors are the sole causes of terrorism or that they first causernone another and then cause terrorism based on temporal precedence is unnatural for twornreasons. Firstly, this delinks the emotionality and rationality, the purposiveness andrnmotivation as well as the need for material and non-material gains within a single causeagentrnof terrorism (the individual terrorist or the group terrorist as unified by grouprnthink and sense of belongingness to the group). Secondly, this disregards the fact thatrnpsychological and economic factors can cause terrorism without being correlated orrnrelated on the basis of temporal precedence, but on the basis of causal power. Therefore,rnthe central argument of this thesis is for simultaneous causation of terrorism byrnpsychological and economic factors applying their causal power on the single entityrn(‘space’) of the mind within a point of time.rn1 Key words: Causation, Chain of causes causation,rnprimarily economic causation, primarily psychologicalrncausation, simultaneous Causation, Terrorism