Chapter 5: The President and National Executive (iii) � maintain national security; or (iv) � prevent that province from taking unreasonable action that is prejudicial to the interests of another province or to the country as a whole. [Sub-s. (1) amended by s. 2(b) of the Constitution Eleventh Amendment Act of 2003.] (2) � If the national executive intervenes in a province in terms of subsection (1)(b)— (a) � it must submit a written notice of the intervention to the National Council of Provinces within 14 days after the intervention began; (b) � the intervention must end if the Council disapproves the intervention within 180 days after the intervention began or by the end of that period has not approved the intervention; and (c) � the Council must, while the intervention continues, review the intervention regularly and may make any appropriate recommendations to the national executive. [Sub-s. (2) substituted by s. 2(c) of the Constitution Eleventh Amendment Act of 2003.] (3) � National legislation may regulate the process established by this section. [S. 100 amended by s. 2 of the Constitution Eleventh Amendment Act of 2003.] Executive decisions 101. (1) A decision by the President must be in writing if it— (a) � is taken in terms of legislation; or (b) � has legal consequences. (2) � A written decision by the President must be countersigned by another Cabinet member if that decision concerns a function assigned to that other Cabinet member. (3) � Proclamations, regulations and other instruments of subordinate legislation must be accessible to the public. (4) � National legislation may specify the manner in which, and the extent to which, instruments mentioned in subsection (3) must be— (a) � tabled in Parliament; and (b) � approved by Parliament. 53