First-past-the-post is the most widely used electoral system in the world, with over 70 countries using it to elect their national legislatures.

First-past-the-post tends to produce strong and stable governments because it usually results in one party winning a majority of seats in the legislature.

First-past-the-post can lead to governments that are not representative of the population because it is possible for a party to win a majority of seats in the legislature with only a minority of the popular vote.

Proportional representation is an electoral system that allocates seats in the legislature based on the proportion of votes that each party receives. This system is more likely to produce a proportional representation of political parties in the legislature than other electoral systems.

Proportional representation encourages a diversity of political parties because it makes it easier for smaller parties to win representation in the legislature.

Proportional representation can lead to weak and unstable governments because it often results in a hung parliament, where no single party has a majority of seats in the legislature.

Mixed-member proportional is an electoral system that combines elements of first-past-the-post and proportional representation. In this system, some seats are elected using first-past-the-post, while others are elected using proportional representation.

Mixed-member proportional combines the advantages of first-past-the-post (strong and stable governments) and proportional representation (a diversity of political parties and representation for minority groups).

Mixed-member proportional can be complex and difficult for voters to understand because it combines elements of two different electoral systems.

Single transferable vote is an electoral system that uses a single transferable vote to elect multiple candidates. In this system, voters rank candidates in order of preference. The candidate with the most first-preference votes is elected, and their surplus votes are transferred to the next candidate on the voter's list.

Single transferable vote encourages a diversity of political parties because it makes it easier for smaller parties to win representation in the legislature.

Single transferable vote can be complex and difficult for voters to understand because it requires voters to rank candidates in order of preference.

Mixed-member proportional is most likely to promote accountability and transparency in government because it combines the advantages of first-past-the-post (strong and stable governments) and proportional representation (a diversity of political parties and representation for minority groups).

The electoral system determines the level of transparency and accountability that elected officials are subject to by setting the rules for how elections are conducted and how elected officials are held accountable for their actions.

All of the above factors can affect the effectiveness of an electoral system in promoting accountability and transparency in government.