A Multistakeholder Approach to the Airport Gate Assignment Problem: Application of Fuzzy Theory for Optimal Performance Indicator Selection

Table 2

Linguistic scoring scheme for selection criteria.

Linguistic scoring	TraFN	Selection criteria
		Significance	Availability	Generalisability
Low	(0, 0.1, 0.4, 0.5)	The PI is insignificant and may not affect airport operation assessment if not included	The PI is hard to measure or data is hard to obtain	The application of PI is difficult in most of the airports
Medium	(0.25, 0.35, 0.65, 0.75)	PI is significant and may improve airport operation assessment	PI can be measured or data is easily accessible	The application of PI asks for certain requirements of the airport, but still applicable
High	(0.5, 0.6, 0.9, 1)	PI is highly significant; the overall benefit assessment may not be reliable if not included	PI can be easily measured, and the data is easy to obtain	PI can be easily applied in most of the airports