25. Staff  26. Class-child ratio  ( a )  Chapter II; sections 30 to 44 inclusive, 47 to 51 inclusive, and 56; sections 77 to 79  inclusive and section 85; Chapter VII; or section s 117 to 120 inclusive and section 127 in  its application to any of the provisions mentioned in this paragraph; ( b )  sections 57, 63 to 66 inclusive, 86 to 89 inclusive, 90(2) and (3), 91(2), (3), (4) and (5),  and 92; Chapter VI; and section 127 in itsapplication to any of the provisions mentioned  in this paragraph,  (i)  the final voting on the Bill in the Assembly takes place not less than three mont hs after  the previous voting thereon in the Assembly; and (ii)  at such final voting the Bill is supported by the votes of not less than two -thirds of all the  Members of the Assembly. ( a )  references to any provision of this Constitution include references to any provision of a  law that altersthat provision; and  ( b )  references to the alteration of any provision of this Constitution include references to the  amendment, modification or re -enactment, with or without modification, of that provision,  the suspension or repeal of that provision and t he making of a different provision in lieu  thereof.  a Bill for an Act of Parliament under this section shall not be passed by the National Assembly  unless-  (4) In so far as it alters any of the provisions mentioned in subsectio n (3)( b ) of this section  no Bill shall be presented to the President for his or her assent unless after its passage by the  Assembly it has been submitted to the electors qualified to vote in the election of the Elected  Members of the National Assembly, and , on a vote taken in such manner as Parliament may  prescribe, the majority of the electors voting have approved the Bill. (5) In this section-  (1) Each session of Parliament shall be held at such place within Botswana and shall  commence at such timeas the President may appoint. (2) There shall be a session of Parliament at least once in every year so that a period of six  months shall not intervene between the last sitting of Parliament in one session and the first sitting  thereof in the next sessio n.  (3) Whenever Parliament is dissolved a general election of the Elected Members of the  Assembly shall be held within 60 days of the date of the dissolution and a session of Parliament  shall be appointed to commence within 30 days of the date of that gen eral election.  (1) The President may at any time prorogue Parliament. (2) Subject to the provisions of this Constitution, the President may at any time dissolve  Parliament.  (3) Subject to the provisions of subsection (4) of this section, Parliament, unless sooner  dissolved, shall continue for five years from the date of the first sitting of the National Assembly  after any dissolution and shall then stand dissolved. (4) At any time when Botswana  is at war, Parliament may from time to time extend the  period of five years specified in subsection (3) of this section for not more than 12 months at a  time:  Provided that the life of Parliament shall not be extended under this subsection for more  than five years.  (5) If, after a dissolution of Parliament and before the holding of the general election of the  Elected Members of the National Assembly, the President considers that, owing to the existence  91.  Prorogation and dissolution of Parliament  90.  Sessions of Parliament  PART V  Summoning, Prorogation and Dissolution  (ss 90-93)  Copyright Government of Botswana