Limits of Acceptable Change

The Limits of Acceptable Change (LAC) framework is a planning system for managing recreation and wilderness areas that shifts the central question from 'how much use is too much?' to 'how much change in conditions is acceptable, and where?' Developed by George Stankey and colleagues for the USDA Forest Service in 1985, LAC accepts that any human use produces some change and that managers must therefore define, in advance, the conditions they are willing to tolerate. The framework proceeds through a structured sequence: partition the area into opportunity classes, choose measurable indicators of resource and social conditions, set explicit standards for each indicator by class, monitor those indicators over time, and trigger management actions whenever a standard is exceeded. By anchoring decisions to desired conditions rather than to a single carrying-capacity number, LAC turns visitor management into a transparent, defensible, and monitorable process.