The document discusses community systems strengthening (CSS) and its importance for health responses. It provides definitions of CSS and outlines four interventions for CSS: 1) community-based monitoring for accountability, 2) advocacy for social accountability, 3) social mobilization and building community linkages, and 4) institutional capacity building for the community sector. Sample activities are described for each intervention, such as monitoring health services, conducting advocacy campaigns, coordinating community actors, and providing training and support to strengthen community organizations.