select two of the three branches of government in Ireland how has the separation of powers principle determined the relationship between these two branches of government

Under his model, the political authority of the state is divided into legislative, executive and judicial powers. He asserted that, to most effectively promote liberty, these three powers must be separate and acting independently. 

Separation of powers, therefore, refers to the division of government responsibilities into distinct branches to limit any one branch from exercising the core functions of another.  The intent is to prevent the concentration of power and provide for checks and balances.  

• The traditional characterizations of the powers of the branches of American government are:
• The legislative branch is responsible for enacting the laws of the state and appropriating the money necessary to operate the government. 
• The executive branch is responsible for implementing and administering the public policy enacted and funded by the legislative branch. 
• The judicial branch is responsible for interpreting the constitution and laws and applying their interpretations to controversies brought before it.

Forty state constitutions specify that government be divided into three branches: legislative, executive and judicial. California illustrates this approach; “The powers of state government are legislative, executive, and judicial. Persons charged with the exercise of one power may not exercise either of the others except as permitted by this Constitution.”

While separation of powers is key to the workings of American government, no democratic system exists with an absolute separation of powers or an absolute lack of separation of powers. Governmental powers and responsibilities intentionally overlap; they are too complex and interrelated to be neatly compartmentalized. As a result, there is an inherent measure of competition and conflict among the branches of government. Throughout American history, there also has been an ebb and flow of preeminence among the governmental branches. Such experiences suggest that where power resides is part of an evolutionary process.