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The debate takes place in the House of Commons and is an important part of Parliament's control over government. It gives MPs a chance to raise issues and find out about the government's plans.

The half hour session usually starts with a routine question from an MP about the Prime Minister's engagements. Following the answer, the MP raises a particular issue - often one of current political significance.

The Leader of the Opposition then follows up on this or another topic. He and the Liberal Democrat leader are the only MPs allowed to come back with further questions.

Subjects raised during Prime Minister's question time vary widely and usually include the key issues of the day. MPs often ask questions relating to their own constituencies.

Prime Minister's question time is particularly important for the leaders of the main political parties as it is regarded by some as a key measure of their overall performance.

You can watch the sessions live online. A recording and transcript are available the following day.