1) Quantitative perspectives developed during World War 2 using mathematics, physics, and other sciences to help with war techniques like statistics, information models, and computer simulations. 2) It has two parts - management science which uses mathematics for decision making, and operation management which focuses on converting inputs to outputs with quality, customer service, and competition. 3) Key techniques include linear programming, game theory, sampling theory, probability theory, simulation, quality control, total quality management, just-in-time, and six sigma. Limitations include difficulty predicting human behavior and overemphasis on mathematics over other skills.