Puerto Rico Constitution
Article III - The Legislature
Section 4.
Section 4. In the first and subsequent elections under this Constitution the division of senatorial and representative districts as provided in Article VIII shall be in effect. After each decennial census beginning with the year 1960, said division shall be revised by a Board composed of the Chief Justice of the Supreme Court as Chairman and of two additional members appointed by the Governor with the advice and consent of the Senate. The two additional members shall not belong to the same political party. Any revision shall maintain the number of senatorial and representative districts here created, which shall be composed of contiguous and compact territory and shall be organized, insofar as practicable, upon the basis of population and means of communication. Each senatorial district shall always include five representative districts.
The decisions of the Board shall be made by majority vote and shall take effect in the general elections next following each revision. The Board shall cease to exist after the completion of each revision.