A sharp fall in oil revenues has rendered Saudia Arabia's long-standing political order unsustainable.
For Ishac Diwan's latest contributions to The Japan Times, see below:
Egypt and Tunesia both underwent regime five years ago and face similar economic problems, but Tunesia's embrace of political inclusion means it could soon be on the path to a healthy recovery.
The vast majority of people in the region want legitimate states that uphold the rule of law, protect civic rights and promote coexistence among communities.
Getting Egypt back on the revolutionary road will depend on a broadly agreed constitution, economic reforms and "street" pressure for a political settlement.
With implications that extend throughout the Arab world, Tunisia is trying to answer the question: Can political Islam help build a truly democratic system