25. Staff  26. Class-child ratio  (3) If a person who is not a member of the National Assembly is elected to the office of  Speaker of the National Assembly, that person shall, by virtue of holding that office, be a member  of the Assembly in addition to the members referred to in subsections (1) and (2) of this  section.  (1) There shall be a Speaker of the National Assembly who shall be elected by the  Members of the Assembly from among persons who are Members of the Assembly or from  among persons who are not Members of the Assembly. (2) The President, the Vice-President, a Minister, an Assistant Minister or a public officer  shall not be qualified to be elected as Speaker. (3) The Speaker shall vacate his or her office -  (4) No business shall be transacted in the National Assembly (other than an election to the  office of Speaker) at any time when the office of Speaker is vacant.  (1) There shall be a Deputy Speaker of the National Assembly who shall be elected from  among the persons who are Members of the Assembly other than the President, the  Vice-President, Ministers or Assistant Ministers. (2) The Members of the National Assembly shall elect a person to the office of Deputy  Speaker when the Assembly first sits after any dissolution and, if the office becomes vacant  otherwise than by reason of the dissolution of the Assembly, at the first sitting  of the Assembly  after the office becomes vacant. (3) The Deputy Speaker shall vacate his or her office -  ( f )  when the Assembly first sits after any dissolu tion of Parliament.  61.  Qualifications for election to National Assembly  60.  Deputy Speaker 59.  Speaker ( a )  57 Elected Members who shall be elected in accordance with the provisions of this  Constitution and subject thereto in accordance with the pro visions of any Act of  Parliament; and  ( b )  four Specially Elected Members who shall be elected in accordance with the First  Schedule to this Constitution and subject thereto in accordance with the provisions of  any Act of Parliament. ( a )  if, having been elected from among the Members of the National  Assembly, he or she  ceases to be a Member of the Assembly otherwise than by reason of a dissolution of  Parliament or if he or she is required by virtue of section 68(2) to (3) of this Constitution,  to cease to perform his or her functions as a Member of th e Assembly;  ( b )  if any circumstances arise that, if he or she were not Speaker, would disqualify him for  election as such;  ( c )  when the Assembly first sits after any dissolution of Parliament; or ( d )  if he or she is removed from office by a resolution o f the Assembly supported by the  votes of not less than two -thirds of all the Members thereof. ( a )  if he or she ceases to be a Member of the National Assembly, otherwise than by reason  of a dissolution of Parliament; ( b )  if any circumstances  arise that, if he or she were not Deputy Speaker, would disqualify  him or her for election as such; ( c )  if he or she is required, by virtue of section 68(2) to (3) of this Constitution, to cease to  perform his or her functions as a Member of the Assembly; ( d )  if he or she is elected as Speaker; ( e )  if he or she is removed from office by a resolution of the Assembly supported by the  votes of not less than two -thirds of all the Members of the Assembly; or Copyright Government of Botswana