The Kellogg School of Management at Northwestern University offers flexible education options for its MBA program, including traditional full-time programs as well as weekend and evening classes. It also offers online classes through Coursera, which have proven extremely popular. As a result, Kellogg is expanding its Coursera offerings to include more classes, such as one in marketing. Students can take the Coursera classes for free but must pay fees to receive certificates they can list on their resumes.