Collective dismissals are employment terminations of several workers on the grounds of economic, technological, structural or similar reasons. National laws and practice may provide for an exact quantitative threshold which, when met, triggers special procedures that the employer needs to follow. Because the consequences of collective dismissals go beyond individual workers and affect the economic health of communities, such procedures serve several purposes. Most of them are aimed at averting or minimizing collective dismissals and at mitigating their effects. They can also help an employer to streamline and legitimize several individual dismissals. Many of these procedures are outlined in Convention No. 158 and Recommendation No. 166. Others are specific to national practices. They range from providing information to workers’ representatives, to having to seek authorization from competent authorities. They may also include providing notification to social security authorities.