The main key to success for these groups lies within their effectiveness to appeal to public opinion. If the single interests group is around for enough time either by succeeding or refusing to give up they usually band together with other similar single interest groups to carry on the fight. Groups such as this are referred to as organizational interest groups and usually contain a higher degree organization than the single interests groups. Joining two or more groups with attention on "structuarl interests" can attracts a wider membership base that in turn provides a larger financial support to work with. With more money the group can take hire small staff of experts including lawyers, public policy experts, and public relations staff to help meet the changes in the government. The structure and basic goals of the organization do not change after the merger it simply becomes more complex. Organizational groups tend to avoid excessive behavior in the name of the cause and the use of media to gather public attention. Instead, the groups use formal briefs to get their point across to the general public. The organizational groups are competent in the political arena but are not as effective as the institutional groups. Institutional groups or "superorganizational" groups have an extensive membership basis that allows for a stable membership of like-minded people. Everyone within the institutional group does not partake in the same specific interest; the members are required to share the information with others in the group to act in a common fashion. The groups have considerable resources to carry out their "concrete and immediate objectives." The resources include a highly trained staff that has extensive knowledge of the government that effects the appropriate government officials and can communicate easily with them. Unlike the single interests or organizational groups, institutional interest groups have the skills and knowledge needed to act as a "go between, keeping the political process going" among the disagreeing agencies.