After watching from the sidelines for a month, the Fairfax County Board of Supervisors will take up Monday the controversial issue of how rural Centreville, one of the last large open areas of the county, should be developed.

On the table for the supervisors' review will be two proposals, one drafted by a board-appointed citizens task force and county planners, and one written by some of the principal developers with land holdings in Centreville.

The county Planning Commission voted last week to recommend the adoption of the task force report, which acknowledges the inevitability of major development in Centreville but urges that it be controlled and that it reflect the predominantly residential character of the area.

The supervisors will be called upon to weigh that recommendation against the plans of developers such as John T. (Til) Hazel of the Hazel-Peterson Co., which wants to build on nearly 450 acres at Rtes. 28 and 29, and the Cadillac-Fairview Co., which owns about 110 acres in the same area.

Those developers filed an alternative plan less than a month ago that called for nearly twice the density suggested by the task force and envisioned the area as an office-commercial center.

Although the board will be deciding the ultimate zoning of 3,000 acres, attention will be focused on how it reacts to the wishes of those two developers.

Lobbying from both sides has been intense, and the supervisors will be facing the conflicting pressures of how their votes will be viewed on the one hand by the politically active civic groups and on the other by area developers, who exert significant influence on county policy.

Most directly affected is Supervisor Elaine N. McConnell (R-Springfield), whose district includes Centreville. McConnell has been highly critical of the report filed by the citizens and county staff members, saying it fails to address the transportation problems in the area.

But despite her reservations, McConnell has promised the residents that she will urge her board colleagues to accept the plan.

The Board of Supervisors is scheduled to take up the issue at 7:30 p.m. in the board meeting room at the Massey Building.