Conceptualising The Free Bus Service Quality Performance Assessment
Table 1: Summary on previous study using SERVQUAL approach
| Authors | Mode of Transportation | Approach |
| Ok and Hengsadeekul (2018) | Bus | SERVQUAL |
| Sam, Hamidu and Daniels (2018) | Bus | SERVQUAL |
| Ceran and Esen (2018) | Public Transportation System | SERVQUAL |
| Francis and Richard (2017) | Rail | SERVQUAL |
| Mikhaylov et al. (2015) | Public Transportation System | SERVQUAL |