Table 5.

Ranking of the main factors.

Factors	Ci+ (rank of TOPSIS)
Delivery speed (DS)	0.33
Planning and reorder segmentation	0.41
Trust development (TD)	0.45
Material quantity adjustment (for different orders)	0.57
Cost reduction(CR)	0.70
Assessment and prioritizing of suppliers for purchasing	0.81
Environmental pressure	1.26
Suppliers empowerment	1.27
Process integration and performance management	1.39
Utilizing of IT tools (UIT)	1.78