An early day motion (EDM), in the Westminster system, is a motion, expressed as a single sentence, tabled by Members of Parliament that formally calls for debate "on an early day". In practice, they are rarely debated in the House and their main purpose is to draw attention to particular subjects of interest. Government ministers, Whips, Parliamentary Private Secretaries, the Speaker of the House of Commons and Deputy Speakers do not normally sign EDMs. EDMs remain open for signature for the duration of the parliamentary session.