4-33. At the brigade echelon and below, the Army stability operations tasks and corresponding stability sectors are often too broad to focus effort appropriately. At lower tactical echelons, lines of effort may be best designed using assigned tasks, based on thorough analysis of the drivers of conflict, resiliencies, and adversary actions. Lines of effort may focus on specific aspects of the local situation, such as the activities of host-nation security forces, local development projects, and essential services restoration. For example, efforts to restore those services are often shaped using lines of effort based on sewage, water, electricity, academics, trash, medical, safety, and other considerations (known as SWEAT-MSO) while addressing the need to provide emergency food aid and shelter. When designing activities, commanders consider the processes the host nation had in place before the instability and the sustainability of changes introduced by stabilization activities. As operations progress, commanders often modify lines of effort after assessing conditions and collaborating with partners.