Table 21.

Linguistic scale for weighting of criteria.

Linguistic terms	IF number for criteria
	$\left(\mu ,\vartheta ,\pi \right)$
Certainly high importance $-$ (CHI)	$\left(0.9,0.1,0\right)$
Very high importance $-$ (VHI)	$\left(0.8,0.1,0.1\right)$
High importance $-$ (HI)	$\left(0.7,0.2,0.1\right)$
Above average importance $-$ (AAI)	$\left(0.6,0.3,0.1\right)$
Average importance $-$ (AI)	$\left(0.5,0.4,0.1\right)$
Under average importance $-$ (UAI)	$\left(0.4,0.5,0.1\right)$
Low importance $-$ (LI)	$\left(0.25,0.6,0.15\right)$
Very low importance $-$ (VLI)	$\left(0.2,0.75,0.15\right)$
Certainly low importance $-$ (CLI)	$\left(0.1,0.9,0.1\right)$