Starbucks cafes in the United States are implementing changes to streamline their drink ordering process in anticipation of increased mobile app orders. The "Siren Craft System" is being introduced to make baristas' jobs easier and speed up service for customers. More than 10% of Starbucks stores have already adopted the system, with plans for full North American implementation by July. These changes come following a disappointing second quarter for Starbucks, with a decrease in sales and traffic. The company is focusing on improving store efficiency and handling unexpected rushes. Starbucks is also offering a $5 food and beverage combo to attract cost-conscious consumers. The introduction of a "play caller" role and reordering of drinks aim to reduce bottlenecks and improve customer experience. These changes are essential as Starbucks opens its app to non-rewards members to increase traffic and orders. Expanding the app and improving store operations are crucial for Starbucks to regain momentum and provide value to customers.