مقایسهٔ روش‌ها

	تحلیل درخت رویداد (ETA)	تحلیل درخت خطا (FTA)
حوزه	قابلیت اطمینان	قابلیت اطمینان
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	2002	1981
پدیدآور	Andrews & Moss	Vesely et al. (US NRC Fault Tree Handbook)
نوع	Forward inductive logic tree	Deductive top-down failure analysis
منبع بنیادین	Andrews, J. D., & Moss, T. R. (2002). Reliability and Risk Assessment (2nd ed.). Professional Engineering Publishing. ISBN: 978-1-86058-290-5	Vesely, W. E., Goldberg, F. F., Roberts, N. H., & Haasl, D. F. (1981). Fault Tree Handbook (NUREG-0492). U.S. Nuclear Regulatory Commission.
نام‌های دیگر	ETA, Event Sequence Diagram Analysis, Initiating Event Analysis, Olay Ağacı Analizi	FTA, Fault Tree Method, Top-Down Reliability Analysis, Hata Ağacı Analizi
مرتبط	2	3
خلاصه	Event Tree Analysis (ETA) is a forward inductive technique used in reliability and risk engineering to model the possible outcomes that follow an initiating event. Starting from a single undesired event, ETA traces all subsequent event sequences through a binary branching tree representing the success or failure of safety barriers and protective systems. Introduced formally in reliability and risk literature by Andrews and Moss (2002), it is widely applied in nuclear, chemical, and aerospace industries to quantify accident sequence probabilities and guide safety decision-making.	Fault Tree Analysis (FTA) is a top-down, deductive reliability method that begins with an undesired top-level failure event and systematically traces backward through chains of contributing causes using Boolean logic gates (AND, OR). First formalized by Watson at Bell Telephone Laboratories in 1961 and later standardized by Vesely, Goldberg, Roberts, and Haasl in the landmark 1981 NRC Fault Tree Handbook, FTA has become a cornerstone of quantitative risk assessment in nuclear, aerospace, and industrial safety engineering.