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Table 3

The fundamental scale.

Intensity of importance Definition Explanation
1 Equal importance Two activities contribute equally to the objective
3 Moderate importance of one over another Experience and judgement slightly favour one activity over another
5 Essential or strong importance Experience and judgement strongly favour
one activity over another
7 Very strong importance An activity is favoured, and its dominance demonstrated in practice
9 Extreme importance The evidence favouring one activity over is of the highest possible order of affirmation
2,4,6,8 Intermediate values between the two adjacent judgements When compromise is needed
Reciprocals If activity i has one of the above numbers assigned to it when compared with activity j, then j has the reciprocal value when compared with i

Source: Adapted from Saaty [29].

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