There are a number of functions in the Prime Minister's Office, as there have been in all prime ministers' offices. The issues management staff is responsible for preparing the Prime Minister for question period, for assisting the preparation of other ministers for question period. And because the House of Commons does not meet every day, but Canadians have a right to expect that questions are answered, and reporters have questions on a seven-day, 24-hour basis, even when the House is not sitting and there's no question period, they're helping to ensure the Prime Minister has answers and that ministers answer those questions.
On April 13th, 2010. See this statement in context.