Committees have the power to 'send for persons and papers', but they cannot compel ministers to attend and give evidence, and there are no formal requirements regarding ministerial co-operation, with the exception of the Committee on Standards and Privileges. Generally, however, governments will co-operate with the work of select committees and ministers will agree to give evidence when invited. Proposals and reports publicised by select committees are not binding, although the government should reply to a report within 60 days.