Hi all,
Hope you all are doing well.
I will appreciate the senior members and educationists If they share here the reasons for the election of the senators or vice versa?
Thanks!

This article is related with the composition and formulation of Senate. If you need to change the process you need to amend the constitution.

59. The Senate
(1) The Senate shall consist of one-hundred and four members, of whom-
(a) fourteen shall be elected by the members of each Provincial Assembly;
(b) eight shall be elected from the Federally Administered Tribal Areas, in such manner as the President may, by Order, prescribe;
(c) two on general seats, and one woman and one technocrat including aalim shall be elected from the Federal Capital in such manner as the President may, by Order, prescribe;
(d) four women shall be elected by the members of each Provincial Assembly;
(e) four technocrats including ulema shall be elected by the members of each Provincial Assembly; and
(f) four non-Muslims, one from each Province, shall be elected by the members of each Provincial Assembly:
Provided that paragraph (f) shall be effective from the next Senate election after the commencement of the Constitution (Eighteenth Amendment) Act, 2010.

(2) Election to fill seats in the Senate allocated to each Province shall be held in accordance with the system of proportional representation by means of the single transferable vote.

(3) The Senate shall not be subject to dissolution but the term of its members, who shall retire as follows, shall be six years:-
(a) of the members referred to in paragraph (a) of clause (1), seven shall retire after the expiration of the first three years and seven shall retire after the expiration of the next three years;
(b) of the members referred to in paragraph (b) of the aforesaid clause, four shall retire of the expiration of the first three years and four shall retire after the expiration of the next three years;
(c) of the members referred to in paragraph (c) of the aforesaid clause,-
(i) one elected on general seat shall retire after the expiration of the first three years and the other one shall retire after the expiration of the next three years; and
(ii) one elected on the seat reserved for technocrat shall retire after the first three years and the one elected on the seat reserved for women shall retire after the expiration of the next three years;
(d) of the members referred to in paragraph (d) of the aforesaid clause, two shall retire after the expiration of the first three years and two shall retire after the expiration of the next three years;
(e) of the members referred to in paragraph (e) of the aforesaid clause, two shall retire after the expiration of the first three years and two shall retire after the expiration of the next three years; and
(f) of the members referred to in paragraph (f) of the aforesaid clause, two shall retire after the expiration of the first three years and two shall retire after the expiration of the next three years:
Provided that the Election Commission for the first term of seats for non-Muslims shall draw a lot as to which two members shall retire after the first three years.

(4) The term of office of a person elected to fill a casual vacancy shall be the unexpired term of the member whose vacancy he has filled.