Is Marketing a science or an art?

I think marketing is a science because marketing is about satisfying customers needs. To understand customer needs we need to develop scientific methods to learn about our customers and the needs they have. Also, the market and consumers generally behave in certain manners and deal with known variables. Porter's five forces is a good example of this. These five forces determine the profitability and behaviors within a market. The five forces being: competition within the industry, customers bargaining power, suppliers bargaining power, threat of entry of new competitors, threat of substitute products. These forces shape the strategy of the company.