There are two types of congressmen: the district and the sectoral representatives.

The Local Government Code of 1991 also provides for the election of 3 "sectoral representatives," which are supposed to come from:

The constitution mandates that the sectoral representatives shall compose 20% of the House of Representatives.

To determine the number of seats for sectoral representatives, the formula for the quotient is:

In addition, 51 seats for sectoral representatives were contested.

The party-list system was first used in 1998; from 1987 to 1995, the president with the concurrence of the Commission on Appointments, appointed the sectoral representatives.

Positions where there are multiple winners usually use plurality-at-large voting, the exception is the election for sectoral representatives in the House of Representatives.

The district and sectoral representatives are elected for a term of three years.

The regular members (3 members/district) and sectoral representatives, have 3-year terms; maximum of 3 consecutive terms.

This led to the increase in the number of sectoral representatives to 51.