A sightline, sight line or visual axis, is a normally unobstructed line-of-sight between an intended observer (or spectator) and a stage, arena, or monument, for example. Sightlines are a particularly important consideration in theatre and stadium design, road junction layout and urban planning. sightline, sight line or visual axis, is a normally unobstructed line-of-sight between an intended observer (or spectator) and a stage, arena, or monument, for example. Sightlines are a particularly important consideration in theatre and stadium design, road junction layout and urban planning.
The CIA does do undercover (spy like) procedures because sometimes it has to but in actuality most of its information comes from people who offer to supply information. These people provide support to the CIA in support of their ideological, religious, political and personal beliefs. Some for vengence and others just out of greed.
The major difference is who they report to and what they focus on. For example, the CIA is the only independent agency in that it only reports to the President (well, technically the DNI but no one actually takes them seriously). In theory, it's the only agency that does all-source analysis of foreign intelligence issues. Most of the other agencies are DOD and report to the Secretary of Defense. DIA, for example, is mainly supposed to focus on military intelligence and related issues. There are a few other agencies/offices that report to other department (for example, the FBI reports to the Attorney General and the Bureau of Intelligence and Research is part of the State Department). Most agencies are divided by the type of intelligence they focus on.