A Modified Combination Rule for Numbers Theory

Table 2

An assessment standard for EIA.

Assessment grade	Numerical rating	Description
	5	Major positive impact
	4	Signification positive impact
	3	Moderately positive impact
	2	Positive impact
	1	Slight impact
	0	No impact
		Slightly negative impact
		Negative impact
		Moderately negative impact
		Significant negative impact
		Major negative impact