(you are largely looking at the factors which promoted the change away from and collapse of the former regime).

Main factors:
(Write about these two factors only do not include any other factors).

1-    Civil society – how it promoted the change

2-    political parties  – how it promoted the change
(Political systems and institutions?)

this may be useful
https://www.accord.org.za/conflict-trends/democratic-transition-tunisia/
and the end notes are many references may be useful as well