ideological
The dominant political party decides the laws of the society which affects public policy.
factional party
That both advocate specific issues on behalf of constituencies which lend them their support.
have similar beliefs about public policy.
They put a lot of pressure on him.
To shape public policy
they try to gain power by winning elective offices
Getting party candidate elected to office
The have similar beliefs about public policy.
In democratic countries all elections are based on the policies of each party. Public policy issues and the manner in which they are resolved are part of a party's platform.
The instrument through which parties formulate, convey, and promote public policy is called a political platform or manifesto. It outlines a party's stance on various issues, their proposed solutions, and their overall vision for governance. It serves as a communication tool to rally support and inform voters about the party's policy priorities.
Weak Party Discipline makes it difficult to enact public policy because of individuals' inability to follow the party policies. Traditionally party members set an agenda in a caucus and agree on this policy, and this policy is enforced by the Party Whip ( the policy maintainer) however some outliers in a party can choose to disagree on there own free will. This causes cohesion on an issue to falter and a party grows less and less stable. If a majority is needed to pass a bill, and a party already needs to convince a few members of the opposition to join their side having weakly disciplined party members only increases their chance that the bill will end up in gridlock and possibly be killed.