Investigation of Lab Fire Prevention Management System of Combining Root Cause Analysis and Analytic Hierarchy Process with Event Tree Analysis

Table 1

Fundamental scale of the AHP [8].

Intensity of importance	Definition	Explanation
1	Equal importance	Two activities contribute equally to the objective
2	Weak	—
3	Moderate importance	Experience and judgment slightly favor one activity over another
4	Moderate plus	—
5	Strong importance	Experience and judgment strongly favor one activity over another
6	Strong plus	—
7	Very strong or demonstrated importance	An activity is favored very strongly over another; its dominance is demonstrated in practice
8	Very, very strong	—
9	Extreme importance	The evidence favoring one activity over another is of the highest possible order of affirmation
Reciprocals of above	If activity has one of the above nonzero numbers assigned to it when compared with activity , then has the reciprocal value when compared with	A reasonable assumption
Rationales	Ratios arising from the scale	If consistency were to be forced by obtaining numerical values to span the matrix