Article 53:
53 Speaker and Deputy Speaker of National Assembly.
(1) After a general election, the National Assembly shall, at its first meeting and to the exclusion of any other business, elect from amongst its members a Speaker and a Deputy Speaker and, so often as the office of Speaker or Deputy Speaker becomes vacant, the Assembly shall elect another member as Speaker or, as the case may be, Deputy Speaker.
(2) Before entering upon office, a member elected as Speaker or Deputy Speaker shall make before the National Assembly oath in the form set out in the Third Schedule.
(3) When the office of Speaker is vacant, or the Speaker is absent or is unable to perform his functions due to any cause, the Deputy Speaker shall act as Speaker, and if, at that time, the Deputy Speaker is also absent or is unable to act as Speaker due to any cause, such member as may be determined by the rules of procedure of the Assembly shall preside at the meeting of the Assembly.
(4) The Speaker or the Deputy Speaker shall not preside at a meeting of the Assembly when a resolution for his removal from office is being considered.
(5) The Speaker may, by writing under his hand addressed to the President, resign his office.
(6) The Deputy Speaker may, by writing under his hand addressed to the Speaker, resign his office.
(7) The office of Speaker or Deputy Speaker shall become vacant if:
(a) he resigns his office;
(b) he ceases to be a member of the Assembly;
(c) he is removed from office by a resolution of the Assembly, of which not less than seven days' notice has been given and which is passed by the votes of the majority of the total membership of the Assembly.
(8) When the National Assembly is dissolved the Speaker shall continue in his office till the person elected to fill the office by the next Assembly enters upon his office.
Chapter 2: "Majlis-e-Shoora (Parliament)" of Part III: "The Federation of Pakistan"