What is the role and responsibility of a company’s CEO in the strategy-making

What is the role and responsibility of a company’s CEO in the strategy-making, strategy-executing process? Provide examples from your observation, research, or experience. Identify a few actions that top executives can take to help instill a spirit of high achievement into the corporate culture and mobilize organizational energy behind the drive for good strategy execution and operating excellence. Provide examples from your observation, research, or experience. How can one tell a winning strategy from a strategy that is mediocre or a loser?