Line filling means to add more items within the present price range. In respond to Pepsi's competitive action, Coca-Cola has invested heavily in research and development to improve Coca-Cola's secret recipe. In tasting and blind testing, most consumers believed that the taste of New Coke was the best among all beverages. However, when Coca-Cola launched the New Coke, it received many complaints from consumers, and the sales of New Coke dropped sharply. Why did the New Coke carefully developed by Coca-Cola fail? Should Coca-Cola still try the product diversification strategies and line filling decisions？