Conflict can arise from differences of opinion between groups on a shared topic. Small-scale conflicts may occur between user groups of an area, while larger-scale conflicts can emerge between companies, governments, environmentalists, and local communities over issues like development projects. Interest groups attempt to influence government decisions on issues important to their members through various methods. These include direct actions like protests and demonstrations, lobbying government ministers directly or through professional lobbyists, and petitions to demonstrate public support, though lobbying is generally seen as most effective for influencing decision-makers.