 In part, this is because research, publicity, building community coalitions, legislative work, legal pressure and other elements of the comprehensive campaign are time-consuming and not immediately effective.But "the ground war" is also staff-intensive (which is to say, expensive), so it is often implemented only in the final stages of the campaign, when the employer has been so weakened that success becomes more likely than not.Research also suggests that workers cannot be "activated" for long periods of time without encountering burnout or discouragement.