A constituent assembly (sometimes know as constitutional convention)

Is a body composed  for the purpose of of drafting or adopting a constitution.

Unlike forms of constitution- making in which a constitution is unilateraly imposed by a sovereign lawmaker.Like ( House of Representative & Senate Congress). The constituent assembly creates a constition through “ internally imposed” actions, in that member of the constituent assembly are themselves citizens, but not necessarily the rulers, of the country for which they are creating a constitution.

 

Constitutions arise in a number of different ways. At the non-democratic extreme of the spectrum, we may imagine a sovereign lawgiver laying down the constitution for all later generations. At the democratic extreme, we may imagine a constituent assembly elected by universal suffrage for the sole task of writing a new constitution. And there are all sorts of intermediate arrangements

 

And this is the some protocol to be done for a charter change.

And what is Charter Change?

 

 Refers to the political and other related processes involved in amending or revising the current 1987 Constitution of the Philippines. Under the current constitution there are three modes of which it could be amended: people's initiative (PI), constituent assembly and constitutional convention. All three would lead to a referendum wherein the proposed amendment/s or revision/s has to be approved by the majority of Filipinos in order to be adopted.

 

What is difference between republic and parliamentary government system?

 

 

A republic is a state or country that is not led by a hereditary monarch,[1][2] in which the people (or at least a part of its people)[3] have an impact on its government.[4][5] The word 'republic' is derived from the Latin phrase res publica which can be translated as "public thing".

 

A parliamentary system is a system of government wherein the ministers of the executive branch are drawn from the legislature, and are accountable to that body, such that the executive and legislative branches are intertwined. In such a system, the head of government is both de facto chief executive and chief legislator.