Systems analysis is sometimes seen as an effort to quantify with modern data processing equipment all of the factors involved in high-level decision-making. In reality, systems analysis includes many non-quantitative techniques which have a wide application to the problems of foreign policy and defense.
Norford, Richard F.
"Systems Analysis: A Missing Element in Foreign Policy Planning,"
Naval War College Review: Vol. 24
, Article 10.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol24/iss1/10