Table 8. Multi-tenant SaaS customization practices of Modification approach.

Id	Customization practice	References
Mod 1	Source code modifications	Sun et al. (2008), Moens & De Turck (2014), Helmich et al. (2009)
Mod 2	Resources allocation for customized code	Sun et al. (2008), Moens & De Turck (2014)
Mod 3	Individual tenant basis	Sun et al. (2008)
Mod 4	Identical customizations	Sun et al. (2008), Moens & De Turck (2014)
Mod 5	Runtime Modification	Moens & De Turck (2014)
Mod 6	Dependency relationship of modified functions	Dong et al. (2010)
Mod 7	Namespaces, inheritance, and polymorphism	Lee & Choi (2012)
Mod 8	Add or changes methods or attributes	Ziani & AlShehri (2015), Kong, Li & Zheng (2010)
Mod 9	Deletion of custom objects, methods, or attributes	Ziani & AlShehri (2015), Kong, Li & Zheng (2010)