The nature of the activities of advocacy groups is highly dependent on the scope and extent on group aims and objectives. Motives for advocacy group action may be based on a shared political, religious, moral, health or commercial position. Groups use varied methods to try to achieve their aims including lobbying, media campaigns, publicity stunts, polls, research, and policy briefings. Some groups are supported or backed by powerful business or political interests and exert considerable influence on the political process, while others have few or no such resources.