The tests apparently went well. In what the Wall Street Journal calls the company's "biggest operational change in years," McDonald's will begin serving all-day breakfast starting October 6. Franchisees voted in favor of the move, which will require not just overhauled menus but overhauled logistics—the same restaurant equipment is designed to cook breakfast, lunch, and dinner, but not simultaneously, explains the Journal. Raw eggs, for example, can't touch hamburgers. The parent company is expected to help individual restaurants foot the cost for things such as dedicated egg griddles, reports CNNMoney. (McDonald's also is changing the way it cooks McMuffins.)