What are the grounds for recall?

Constitution of Tuvalu

(Adopted on 1 October 1978)

http://www.tuvaluislands.com/const_tuvalu.htm

Article99. Recall of incapacitated member
(1) If more than 50 percent of the persons who are registered as electors forParliamentary elections in an electoral district sign a petition to the Head ofState stating that a member of Parliament for that district is unable toperform properly the functions of a member because of infirmity of body ormind, the succeeding provisions of this section apply. […]