How marketing efforts can be controlled and evaluated?

Marketing Efforts with Implementation, Control and Evaluation:

Marketing is not a controlled process within an insulated lab. This is prone to mishaps, end minute changes, abstract shifts, volatility of markets, and the political upheavals and, in simple, to the vagaries of human life and natural disasters. Several marketing efforts are identified to have backfired. And the others have yielded lukewarm results. Conversely, marketing needs constant fine tuning and adjustments, to respond and reflect for the kaleidoscopic environment of our times.