1. Harmony between legislature and executive.
2. Responsible government.
3. Prevent despotism.
4. Ready alternative government.
5. Wide representation.
Harmony between legislature and executive the greatest advantage of the parliamentary system is that it insurance harmonious relationship and cooperation between the legislative and executive organs of the government. the executive is a part of the Legislature and both are interdependent at work. as a result, there is less scope for disputes and conflicts between the two organs.
Responsible government by its very nature, the parliamentary system establishes a responsible government. the Ministers are responsible to the Parliament for all their acts of omission and commission. the Parliament exercises control over the ministers through various this crisis like question hour, discussions, adjournment motion, no confidence motion, etc
Prevents despotism under this system, the executive authority is vested in a group of individuals (Council of Ministers) and not in a single person. the dispersal of authority check the dictatorial tendencies of the executive. moreover, the executive is responsible to the Parliament and can be removed by a no-confidence motion.
Ready alternative government in case the ruling party loses its majority, the head of the state can invite the opposition party to form the government. this means and alternative government can be formed without fresh election. Hence dr. Jennings says, 'the leader of the opposition is alternative Prime Minister.
Wide representation in a parliamentary system, the executive consists of a group of individuals, (i.e., ministers who are representatives of the people). hence, it is possible to provide representation to all sections and regions in the government. the Prime Minister while selecting his ministers can take this factor into consideration.